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Researche and development engineer (fixed-term)\\

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Research and development engineer (fixed-term)\\

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Deadline to apply : March 31st, 2020\\\

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Deadline to apply : March 31st, 2020

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Master internship offer\\

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Master internship\\

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Duration: 5 months
Research and development engineer (fixed-term)\\

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Duration: 5 months

Postdoc\\

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Researche and development engineer (fixed-term)\\

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Postdoc
Advanced computational modeling and inverse design of planar optical devices
Duration: 12 months
Deadline to apply : December 31st, 2019

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Master internship offer\\

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Duration: 5 months\\\

to:

Duration: 5 months\\

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Duration: 12 months\\\

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Duration: 12 months\\

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Duration: 5 months\\

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Duration: 5 months\\\

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Duration: 12 months\\

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Duration: 12 months\\\

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Numerical optimization of ultrathin solar cells
Duration: 5 months\\

November 14, 2019, at 09:15 AM by 138.96.200.15 -

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Numerical modeling of nanophotonic devices using high order finite element type solvers\\

to:

Computation of electromagnetic quasi-normal modes in nanostructures using contour integration techniques
Duration: 12 months
Deadline to apply : September 30, 2020

Numerical modeling of nanophotonic devices using high order finite element type solvers\\

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Deadline to apply : March 31st, 2020

to:

Deadline to apply : March 31st, 2020

Postdoc
Advanced computational modeling and inverse design of planar optical devices
Duration: 12 months
Deadline to apply : December 31st, 2019

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Master internship\\

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Numerical modeling of nanophotonic devices using high order finite element type solvers
Duration: 12 months

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Numerical modeling of nanophotonic devices using high order finite element type solvers
Duration: 12 months
Deadline to apply : March 31st, 2020

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Numerical modeling of THz photoconductive antennas in a Discontinuous Galerkin Time-Domain framework
Duration: 6 months

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Exascale enabled finite element solvers for nanophotonics
Duration: 16 months Research and development engineer (fixed-term)
High order finite element solvers for the design of nanophotonic devices\\

to:

Numerical modeling of nanophotonic devices using high order finite element type solvers\\

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In this multidisciplinary work involving reserachers from different institutes, we present a computational methodology to optimize metasurface designs. We complement this computational methodology by quantifying the impact of fabrication uncertainties on the experimentally characterized components.

to:

In this multidisciplinary work involving researchers in physics and applied mathematics, we present a computational methodology to optimize metasurface designs. We complement this computational methodology by quantifying the impact of fabrication uncertainties on the experimentally characterized components.

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(d) Typical broadband response of the transmission efficiency for an optimized metasurface obtained using two different electromagnetic simulation solvers, the Discontinuous Galerkin Time-Domain solver (DGTD) solver and the Rigorous= Coupled Wave Analysis (RCWA) solver in orange dashed.

to:

(d) Typical broadband response of the transmission efficiency for an optimized metasurface obtained using two different electromagnetic simulation solvers, the Discontinuous Galerkin Time-Domain solver (DGTD) solver and the Rigorous Coupled Wave Analysis (RCWA) solver in orange dashed.

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(b)-(c) The metasurface-based device works essentially as conventional echelette blazed grating. Replacing the periodic echelette with a subwavelength array of nanoridges.

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(b)-(c) The metasurface-based device works essentially as conventional echelette blazed grating, by replacing the periodic echelette with a subwavelength array of nanoridges.

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(a) Illustrative schematic of the angular deflection property of a phase gradient metasurface. (b)-(c) The metasurface-based device works essentially as conventional echelette blazed grating. Replacing the periodic echelette with a subwavelength array of nanoridges. (d) ypical broadband response of the transmission efficiency for an optimized metasurface obtained using two different electromagnetic simulation solvers, the Discontinuous Galerkin Time-Domain solver (DGTD) solver and the Rigorous= Coupled Wave Analysis (RCWA) solver in orange dashed.

to:

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(a) Illustrative schematic of the angular deflection property of a phase gradient metasurface. (b)-(c) The metasurface-based device works essentially as conventional echelette blazed grating. Replacing the periodic echelette with a subwavelength array of nanoridges. (d) Typical broadband response of the transmission efficiency for an optimized metasurface obtained using two different electromagnetic simulation solvers, the Discontinuous Galerkin Time-Domain solver (DGTD) solver and the Rigorous= Coupled Wave Analysis (RCWA) solver in orange dashed.

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(a) Illustrative schematic of the angular deflection property of a phase gradient metasurface. (b)-(c) The metasurface-based device works essentially as conventional echelette blazed grating. Replacing the periodic echelette with a subwavelength array of nanoridges. (d) ypical broadband response of the transmission efficiency for an optimized metasurface obtained using two different electromagnetic simulation solvers, the Discontinuous Galerkin Time-Domain solver (DGTD) solver and the Rigorous= Coupled Wave Analysis (RCWA) solver in orange dashed.

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March 19, 2019, at 08:25 AM by 138.96.200.15 -

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News - November 2018

to:

News - February 2019

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Paper entitled "The Multiscale Hybrid-Mixed method for the Maxwell equations in heterogeneous media" by . Lanteri, D. Paredes, C. Scheid and F. Valentin

to:

Paper entitled "Optimization and uncertainty quantification of gradient index metasurfaces" by N. Schmitt, N. Georg, G. Brière, D. Loukrezis, S. Héron, S. Lanteri, C. Klitis, M. Sorel, U. Römer, H. De Gersem, S. Vézian and P. Genevet Opt. Mat. Express., Vol. 9, No. 2, pp. 892-910 (2019)
In this multidisciplinary work involving reserachers from different institutes, we present a computational methodology to optimize metasurface designs. We complement this computational methodology by quantifying the impact of fabrication uncertainties on the experimentally characterized components.

News - November 2018

(:linebreaks:)

Paper entitled "The Multiscale Hybrid-Mixed method for the Maxwell equations in heterogeneous media" by S. Lanteri, D. Paredes, C. Scheid and F. Valentin

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Master internship
Numerical modeling of THz photoconductive antennas in a Discontinuous Galerkin Time-Domain framework
Duration: 6 months

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Development and application of high order finite element solvers for nanoscale light-matter interactions\\

to:

High order finite element solvers for the design of nanophotonic devices\\

December 09, 2018, at 11:58 AM by 82.228.254.112 -

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Kick-off of the EPEEC (European joint Effort toward a Highly Productive Programming Environment for Heterogeneous Exascale Computing) H2020 project

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Nanowaveguide problem: contour lines of

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Nanowaveguide problem: contour lines of

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Nanowaveguide problem: contour lines of the amplitude of the electric field. Left: DGTD method with 5898,824 Dof - Middle: DGTD methid withg 4,608 DoF - Right: MHM-DGTD method with 9,216 DoF

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SIAM J. Multiscale Model. Simul., Vol. 16, No. 4, pp.1648–1683 (2018)

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SIAM J. Multiscale Model. Simul., Vol. 16, No. 4, pp.1648–1683 (2018)

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Simulating wave propagation in three-dimensional highly heterogeneous media or heterogeneous media with complex interfaces remains a challenging task. In many modern applications, this phenomena is associated with high frequency responses when compared to the size of the domain. Classical numerical methods, like finite difference or finite element methods, must use a very fine mesh to obtain high quality solutions, which results in huge computational resource requirements. The Multiscale Hybrid-Mixed (MHM) method implements the “divide-and-conquer” philosophy to obtain accurate solutions on coarse meshes. Based on a classical hybridization procedure, the MHM method yields a staggered algorithm , which is organized around two main ingredients: (1) a set of multiscale basis functions, which are constructed as the solution of local problems defined in each macro cell of the coarse mesh; (2) a global problem defined on the skeleton of the coarse mesh that gives rise to a classical finite element formulation leveraging the multiscale basis functions. In the context of electromagnetic wave propagation modelled by the system of time-domain Maxwell equations, the local problems are solved using a classical DGTD method.

to:

Simulating wave propagation in three-dimensional highly heterogeneous media or heterogeneous media with complex interfaces remains a challenging task. In many modern applications, this phenomena is associated with high frequency responses when compared to the size of the domain. Classical numerical methods, like finite difference or finite element methods, must use a very fine mesh to obtain high quality solutions, which results in huge computational resource requirements. The Multiscale Hybrid-Mixed (MHM) method implements the “divide-and-conquer” philosophy to obtain accurate solutions on coarse meshes. Based on a classical hybridization procedure, the MHM method yields a staggered algorithm , which is organized around two main ingredients: (1) a set of multiscale basis functions, which are constructed as the solution of local problems defined in each macro cell of the coarse mesh; (2) a global problem defined on the skeleton of the coarse mesh that gives rise to a classical finite element formulation leveraging the multiscale basis functions. In the context of electromagnetic wave propagation modelled by the system of time-domain Maxwell equations, the local problems are solved using a classical DGTD method.

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News - November 2018

(:linebreaks:)

Paper entitled "The Multiscale Hybrid-Mixed method for the Maxwell equations in heterogeneous media" by . Lanteri, D. Paredes, C. Scheid and F. Valentin SIAM J. Multiscale Model. Simul., Vol. 16, No. 4, pp.1648–1683 (2018)

Simulating wave propagation in three-dimensional highly heterogeneous media or heterogeneous media with complex interfaces remains a challenging task. In many modern applications, this phenomena is associated with high frequency responses when compared to the size of the domain. Classical numerical methods, like finite difference or finite element methods, must use a very fine mesh to obtain high quality solutions, which results in huge computational resource requirements. The Multiscale Hybrid-Mixed (MHM) method implements the “divide-and-conquer” philosophy to obtain accurate solutions on coarse meshes. Based on a classical hybridization procedure, the MHM method yields a staggered algorithm , which is organized around two main ingredients: (1) a set of multiscale basis functions, which are constructed as the solution of local problems defined in each macro cell of the coarse mesh; (2) a global problem defined on the skeleton of the coarse mesh that gives rise to a classical finite element formulation leveraging the multiscale basis functions. In the context of electromagnetic wave propagation modelled by the system of time-domain Maxwell equations, the local problems are solved using a classical DGTD method.

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Paper entitled "Fitting experimental dispersion data with a simulated annealing method for nano-optics applications" by J. Viquerat
J. of Nanophotonics, Vol. 12, No. 3, 036014 (2018)

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Paper entitled "Simulation of three-dimensional nanoscale light interaction with spatially dispersive metals using a high order curvilinear DGTD method" by N. Schmitt, C. Scheid, J. Viquerat and S. Lanteri, J. Comput. Phys., Vol. 373, pp. 210–229 (2018)

to:

Paper entitled "Simulation of three-dimensional nanoscale light interaction with spatially dispersive metals using a high order curvilinear DGTD method" by N. Schmitt, C. Scheid, J. Viquerat and S. Lanteri J. Comput. Phys., Vol. 373, pp. 210–229 (2018)

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, SIAM J. Sci. Comput., Vol. 39, No. 3, A831–A859 (2017)

to:

Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat SIAM J. Sci. Comp., Vol. 39, No. 3, pp. A831–A859 (2017)

November 11, 2018, at 04:27 PM by 82.228.254.112 -

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Welcome to Mahmoud Elsawy who joined the team as a postodtcoral fellow!
Paper entitled "Simulation of three-dimensional nanoscale light interaction with spatially dispersive metals using a high order curvilinear DGTD method" by N. Schmitt, C. Scheid, J. Viquerat and S. Lanteri, J. Comput. Phys., Vol. 373, pp. 210–229 (2018)

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(:table border='0' width='400px' align='right':) (:cellnr align='center' width='10%':) http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg (:cell align='center' width='10%':)Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team! (:tableend:)

to:

http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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(:table border='0' width=200px align='center':) (:cellnr align='center' width='10%':) http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg (:cell align='center':) Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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(:table border='0' width='20%' align='right':) (:cellnr align='center' width='10%':) http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg (:cell align='center' width='10%':)Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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(:cell align='top':) Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team! (:cell align='center':) (:cell align='center':)

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(:cell align='center':) Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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(:table border='0' align='center':) (:cellnr align='center' width='10%':) http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg (:cell align='center':) Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team! (:tableend:)

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http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg | Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg | Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg | Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg | Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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News - October 2018

(:linebreaks:)

http://www-sop.inria.fr/nachos/pics/people/T-Chaumont.jpeg | Welcome to Théophile Chaumont-Frelet who has been awarded a Junior research scientist position in the team!

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(:linebreaks:)

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News - September 2018

Congratulations to Nikolaï Schmitt who defended his doctoral thesis on September 27!

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Development and application of high order finite element solvers for nanoscale light-matter interactions\\

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Development and application of high order finite element solvers for nanoscale light-matter interactions\\

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Research and development engineer (fixed-term)
Development and application of high order finite element solvers for nanoscale light-matter interactions
Duration: 12 months

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Master internship offers
Multiscale finite element method for the solution of the frequency-domain Maxwell equations
Duration: 6 months
Optimal design of nanostructured devices driven by specific resonant and scattering properties
Duration: 6 months
Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes
Duration: 6 months

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Master internship offers
Multiscale finite element method for the solution of the frequency-domain Maxwell equations
Duration: 6 months
Optimal design of nanostructured devices driven by specific resonant and scattering properties
Duration: 6 months
Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes
Duration: 6 months

March 07, 2018, at 08:13 AM by 138.96.200.15 -

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in Multiscale Computational Simulations - project that has started in Januray 2018 for a duration of 2 years, and which involve researchers from Brazil, Chile and France.

to:

in Multiscale Computational Simulations - project that has started in Januray 2018 for a duration of 2 years, and which involves researchers from Brazil, Chile and France.

March 07, 2018, at 08:12 AM by 138.96.200.15 -

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in Multiscale Computational Simulations - project that has started in Januray 2018 for a duration of 2 years.

to:

in Multiscale Computational Simulations - project that has started in Januray 2018 for a duration of 2 years, and which involve researchers from Brazil, Chile and France.

March 07, 2018, at 08:11 AM by 138.96.200.15 -

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Congratulations to Fréderic Valentin who has been awarded an Inria International Chair for the period 2018-2022! The research project that he wil lead during this period aims at devising innovative multiscale numerical algorithms for the simulation of wave-matter interaction at the nanoscale. This topic is also at the heart of the Math-Amsud PHOTOM - Photovoltaic Solar Devices

to:

Congratulations to Fréderic Valentin who has been awarded an Inria International Chair for the period 2018-2022! The research project that he will lead during this period aims at devising innovative multiscale numerical algorithms for the simulation of wave-matter interaction at the nanoscale. This topic is also at the heart of the Math-Amsud PHOTOM - Photovoltaic Solar Devices

March 07, 2018, at 08:10 AM by 138.96.200.15 -

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Congratulations to Fréderic Valentin who has been awarded an Inria International Chair for the period 2018-2022!

to:

Congratulations to Fréderic Valentin who has been awarded an Inria International Chair for the period 2018-2022! The research project that he wil lead during this period aims at devising innovative multiscale numerical algorithms for the simulation of wave-matter interaction at the nanoscale. This topic is also at the heart of the Math-Amsud PHOTOM - Photovoltaic Solar Devices in Multiscale Computational Simulations - project that has started in Januray 2018 for a duration of 2 years.

March 07, 2018, at 08:01 AM by 138.96.200.15 -

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Congratulations to Fréderic Valentin who has been awarded an Inria International Chair for the period 2018-2022!

(:linebreaks:)

March 06, 2018, at 08:16 AM by 138.96.200.15 -

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Kick-off meeting of the Math-Amsud PHOTOM - Photovoltaic Solar Devices

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Kick-off meeting of the Math-Amsud PHOTOM - Photovoltaic Solar Devices

March 05, 2018, at 05:17 PM by 82.228.254.112 -

March 05, 2018, at 05:13 PM by 82.228.254.112 -

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Duration: 16 months

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Duration: 6 months.\\

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Duration: 6 months\\

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Duration: 6 months.\\

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Duration: 6 months\\

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Duration: 6 months.

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Duration: 6 months

March 05, 2018, at 04:50 PM by 82.228.254.112 -

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Scattering of a plane wave by a 50 nm gold nanosphere: scattering (left) and absorption (right) cross sections

to:

Scattering of a plane wave by a 50 nm gold nanosphere: scattering (left) and absorption (right) cross sections for calculations based on a HDG method with quadratic interpolation of the EM field components

March 05, 2018, at 04:49 PM by 82.228.254.112 -

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More details - Work done in the context of the PhD project of Hao Wang

to:

More details - Work done in the context of the PhD project of Hao Wang
H. Wang, L. Xu, B. Li, S. Descombes and S. Lanteri
A new family of exponential-based high order DGTD methods for modelling 3D transient multiscale electromagnetic problems
IEEE Trans. Ant. Propag., Vol. 65, No. 11, pp. 5960-5974 (2017)

March 05, 2018, at 04:48 PM by 82.228.254.112 -

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Papers on reduced-order modeling based on Proper Orthogonal Decomposition for time-domain electromagnetics\\

to:

Papers on reduced-order modeling based on Proper Orthogonal Decomposition for time-domain electromagnetics in the context of a collaborative work with researchers from UESTC, Chengdu, China.\\

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IEEE Trans. Ant. Propag., Vol. 66, No. 1, pp. 242-254 (2018)\\

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IEEE Trans. Ant. Propag., Vol. 66, No. 1, pp. 242-254 (2018)

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News - February 2018

(:linebreaks:)

Papers on reduced-order modeling based on Proper Orthogonal Decomposition for time-domain electromagnetics
K. Li, T.-Z. Huang, L. Li and S. Lanteri
A reduced-order DG formulation based on POD method for the time-domain Maxwell’s equations in dispersive media
J. Comput. Appl. Math., Vol. 336, pp. 249-266 (2018)
K. Li, T.-Z. Huang, L. Li, S. Lanteri, L. Xu and B. Li
A reduced-order discontinuous Galerkin method based on POD for electromagnetic simulation
IEEE Trans. Ant. Propag., Vol. 66, No. 1, pp. 242-254 (2018)\\

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Scattering of a plane wave by a 50 nm gold nanosphere: magnitude of E field at frequencies 1070 THz (left), 1185 THz (middle) and 1300 THz (right) http://www-sop.inria.fr/nachos/pics/news/2018/mar/Cscahighf.jpg %width=180px% http://www-sop.inria.fr/nachos/pics/news/2018/mar/Cabshighf.jpg

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Scattering of a plane wave by a 50 nm gold nanosphere: magnitude of E field at frequencies 1070 THz (left), 1185 THz (middle) and 1300 THz (right)
http://www-sop.inria.fr/nachos/pics/news/2018/mar/Cscahighf.jpg %width=220px% http://www-sop.inria.fr/nachos/pics/news/2018/mar/Cabshighf.jpg
Scattering of a plane wave by a 50 nm gold nanosphere: scattering (left) and absorption (right) cross sections

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New high order Hybridized Discontinuous Solver (HDG) for frequency-domain plasmonics in 3D.

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New high order Hybridized Discontinuous Solver (HDG) for frequency-domain plasmonics in 3D - Work done in the context of the postdoctoral project of Mostafa Javadzadeh Moghtader http://www-sop.inria.fr/nachos/pics/news/2018/mar/Efield1070THzViz2.png %width=180px% http://www-sop.inria.fr/nachos/pics/news/2018/mar/Efield1185THzViz2.png %width=180px% http://www-sop.inria.fr/nachos/pics/news/2018/mar/Efield1300THzViz2.png
Scattering of a plane wave by a 50 nm gold nanosphere: magnitude of E field at frequencies 1070 THz (left), 1185 THz (middle) and 1300 THz (right)

March 05, 2018, at 03:34 PM by 82.228.254.112 -

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March 05, 2018, at 03:33 PM by 82.228.254.112 -

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News - May 2017

to:

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New high order Hybridized Discontinuous Solver (HDG) for frequency-domain plasmonics in 3D.

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News - May 2017

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Paper entitled "An implicit hybridized discontinuous Galerkin method for the 3D time-domain Maxwell equations" by A. Christophe, S. Descombes and S. Lanteri, to appear in Appl. Math. Comput., 2017

March 05, 2018, at 03:16 PM by 82.228.254.112 -

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Multiscale finite element method for the solution of the frequency-domain Maxwell equations\\ Duration: 6 months.
Optimal design of nanostructured devices driven by specific resonant and scattering properties\\ Duration: 6 months.\\

to:

Multiscale finite element method for the solution of the frequency-domain Maxwell equations
Duration: 6 months.
Optimal design of nanostructured devices driven by specific resonant and scattering properties
Duration: 6 months.\\

March 05, 2018, at 03:14 PM by 82.228.254.112 -

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Research and development (fixed-term)\\

to:

Research and development engineer (fixed-term)\\

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News - March 2018

(:linebreaks:)

Kick-off meeting of the Math-Amsud PHOTOM - Photovoltaic Solar Devices in Multiscale Computational Simulations - project
March 13-15, LNCC, Petrópolis, Brazil

March 05, 2018, at 02:45 PM by 82.228.254.112 -

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Master internships for 2018

to:

Job openings

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Multiscale finite element method for the solution of the frequency-domain Maxwell equations\\ Duration: 6 months.

Optimal design of nanostructured devices driven by specific resonant and scattering properties\\ Duration: 6 months.

to:

Research and development (fixed-term)
Exascale enabled finite element solvers for nanophotonics
Master internship offers
Multiscale finite element method for the solution of the frequency-domain Maxwell equations\\ Duration: 6 months.
Optimal design of nanostructured devices driven by specific resonant and scattering properties\\ Duration: 6 months.\\

January 08, 2018, at 07:20 AM by 138.96.200.15 -

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Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes\\ Duration: 6 months.

to:

Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes
Duration: 6 months.

January 08, 2018, at 07:20 AM by 138.96.200.15 -

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Multiscale finite element method for the solution of the frequency-domain Maxwell equations (6 months)
Optimal design of nanostructured devices driven by specific resonant and scattering properties (6 months)
Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes (6 months)

to:

Multiscale finite element method for the solution of the frequency-domain Maxwell equations\\ Duration: 6 months.

Optimal design of nanostructured devices driven by specific resonant and scattering properties\\ Duration: 6 months.

Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes\\ Duration: 6 months.

January 08, 2018, at 07:19 AM by 138.96.200.15 -

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Multiscale finite element method for the solution of the frequency-domain Maxwell equations (6 months)

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Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions (6 months)\\

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Optimal design of nanostructured devices driven by specific resonant and scattering properties
Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions
Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes

to:

Optimal design of nanostructured devices driven by specific resonant and scattering properties (6 months)
Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions (6 months)
Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes (6 months)

November 29, 2017, at 02:45 PM by 138.96.200.15 -

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Optimal design of nanostructured devices driven by specific resonant and scattering properties

Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions\\\

to:

Optimal design of nanostructured devices driven by specific resonant and scattering properties
Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions\\

November 28, 2017, at 04:30 PM by 138.96.200.15 -

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Master internships for 2018\\\

to:

Master internships for 2018

(:linebreaks:)

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Master internships for 2018\\

to:

Master internships for 2018\\\

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Optimal design of nanostructured devices driven by specific resonant and scattering properties
Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions

to:

Optimal design of nanostructured devices driven by specific resonant and scattering properties

Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions\\\

November 28, 2017, at 04:27 PM by 138.96.200.15 -

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Optimal design of nanostructured devices driven by specific resonant and scattering properties [[http://www-sop.inria.fr/nachos/tmp/internship_lodgtd.pdf | Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions]
[[http://www-sop.inria.fr/nachos/tmp/internship_hexadgtd.pdf | Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes]

to:

Optimal design of nanostructured devices driven by specific resonant and scattering properties
Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes

November 28, 2017, at 04:27 PM by 138.96.200.15 -

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Optimal design of nanostructured devices driven by specific resonant and scattering properties\\

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Optimal design of nanostructured devices driven by specific resonant and scattering properties

November 28, 2017, at 04:26 PM by 138.96.200.15 -

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(:if false:) January 2017
Post-doctoral project - Design of a generic parallel domain decomposition solver based on boundary transfer conditions
PhD project - Numerical modeling of light diffusion in nanostructured optical fibers (:ifend:)

to:

Master internships for 2018
Optimal design of nanostructured devices driven by specific resonant and scattering properties
[[http://www-sop.inria.fr/nachos/tmp/internship_lodgtd.pdf | Local approximation order strategy in a DGTD method for the simulation of nanoscale light-matter interactions]
[[http://www-sop.inria.fr/nachos/tmp/internship_hexadgtd.pdf | Simulation of light absorption in nanostructured materials using a DGTD method formulated on non-conforming hybrid hexahedral/tetrahedral meshes]

October 16, 2017, at 10:01 AM by 138.96.200.15 -

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput., 2017

to:

Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, SIAM J. Sci. Comput., Vol. 39, No. 3, A831–A859 (2017)

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Exponential-based high order DGTD method for modeling

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High order DGTD method based on exponential time integrators for modeling

May 19, 2017, at 03:56 PM by 138.96.200.15 -

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More details - Work done in the context of the PhD project of Hao Wang

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More details - Work done in the context of the PhD project of Hao Wang

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More details - Work done in the context of the PhD project of Alexis Gobé

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More details - Work done in the context of the PhD project of Alexis Gobé

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More details - Work done in the context of the PhD project of Nikolai Schmitt

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More details - Work done in the context of the PhD project of Nikolai Schmitt

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Paper entitled "An implicit hybridized discontinuous Galerkin method for the 3D time-domain Maxwell equations" by A. Christophe, S. Descombes and S. Lanteri, to appear in Appl. Math. Comput., 2017

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Paper entitled "An implicit hybridized discontinuous Galerkin method for the 3D time-domain Maxwell equations" by A. Christophe, S. Descombes and S. Lanteri, to appear in Appl. Math. Comput., 2017

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News - February 2017

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News - May 2017

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat To appear in SIAM J. Sci. Comput., 2017

to:

Paper entitled "An implicit hybridized discontinuous Galerkin method for the 3D time-domain Maxwell equations" by A. Christophe, S. Descombes and S. Lanteri, to appear in Appl. Math. Comput., 2017

(:linebreaks:)

Exponential-based high order DGTD method for modeling 3D transient multiscale electromagnetic problems
More details - Work done in the context of the PhD project of Hao Wang

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News - February 2017

(:linebreaks:)

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput., 2017

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More details - Work performed by Alexis Gobé

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More details - Work done in the context of the PhD project of Alexis Gobé

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More details - Work performed by Nikolai Schmitt

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More details - Work done in the context of the PhD project of Nikolai Schmitt

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General news

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Highlight of the month\\

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General news\\

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Highlight of the month\\

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To appear in SIAM J. Sci. Comput.

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To appear in SIAM J. Sci. Comput., 2017

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More details - Work performed by Alexis Gobé\\

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More details - Work performed by Alexis Gobé

March 13, 2017, at 01:47 PM by 138.96.200.15 -

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More details - Work performed by Alexis Gobé

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More details - Work performed by Alexis Gobé\\

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More details - Work performed by Alexis Gobé
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More details - Work performed by Alexis Gobé

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Simulation of light trapping in thin-film solar cells with textured layers
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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat To appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat\\ To appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.\\\

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.\\

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.\\\

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.\\

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http://www-sop.inria.fr/nachos/pics/news/2017/feb/nansph_shell.png | Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

to:

http://www-sop.inria.fr/nachos/pics/news/2017/feb/nansph_shell.png | Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

(:table border='0' align='center':) (:cellnr align='center':) http://www-sop.inria.fr/nachos/pics/news/2017/feb/nansph_shell-1.png (:cell align='center':) http://www-sop.inria.fr/nachos/pics/news/2017/feb/nansph_shell-2.png (:tableend:)

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http://www-sop.inria.fr/nachos/pics/news/2017/feb/nansph_shell.png | Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

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(:table border='0' align='center':) (:cellnr align='center':) http://www-sop.inria.fr/nachos/pics/news/2017/feb/nansph_shell-1.png (:cell align='center':) http://www-sop.inria.fr/nachos/pics/news/2017/feb/nansph_shell-2.png (:tableend:)

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Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput., 2017

to:

Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput.

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nansph_shell-1.png http://www-sop.inria.fr/nachos/pics/news/2017/jan/nansph_shell-2.png

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News - February 2017

(:linebreaks:) General news
Paper entitled "Analysis of a generalized dispersive model coupled to a DGTD method with application to nanophotonics" by S. Lanteri, C. Scheid and J. Viquerat, to appear in SIAM J. Sci. Comput., 2017

(:linebreaks:)

Highlight of the month\\

February 09, 2017, at 08:40 AM by 134.59.101.253 -

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Post-doctoral project - Design of a generic parallel domain decomposition solver based on boundary transfer conditions

Master internship - Efficient finite element type solvers for the numerical modeling of nanoscale light/matter interaction\\\

to:

Post-doctoral project - Design of a generic parallel domain decomposition solver based on boundary transfer conditions\\

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Master internship - Advanced computational modeling of silicon waveguide devices based on Sub-Wavelength Gratings

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Post-doctoral project - Design of a generic parallel domain decomposition solver based on boundary transfer conditions\\\

February 06, 2017, at 04:44 PM by 138.96.200.15 -

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First review meeting and workshop of the HPC4E project
January 30-February 2, 2017 - Inria Sophia Antipolis-Méditerranée

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First review meeting and workshop of the HPC4E project
January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée

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February 06, 2017, at 04:43 PM by 138.96.200.15 -

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General news\\

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More details - Nikolai Schmitt

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More details - Work performed by Nikolai Schmitt

February 06, 2017, at 04:42 PM by 138.96.200.15 -

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Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model More details

to:

Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model
More details - Nikolai Schmitt

February 06, 2017, at 04:38 PM by 138.96.200.15 -

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We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Figure 1. Dimer sphere setup and sketched of incident plane wave.
Combining length dimensions in a range less than 100 nm and electromagnetic wavelengths in the optical regime requires an appropriate material model for the metal, i.e. perfectly conducting (PEC) assumption as in the microwave regime is not valid anymore du to the relatively large skin-depth. Well-known dispersion models are e.g. local Drude and Drude-Lorentz dispersion models that have been comprehensively studied in the last decades. If geometric details of the structure under investigation approach length dimensions below approximately 25 nm (this value strongly depends on the material model and the actual geometry), spatial dispersion, i.e. the non-local response of the electron gas significantly increases its influence.

Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis.

Figure 2 shows the resulting scattering cross-sections for the local and non-local dispersion model. A comparison of two numerical fluxes, i.e. centered fluxes and upwind fluxes is provided on this figure.

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case (DGTD-ce: centered flux DGTD solver - DGTD-up: upwind flux DGTD solver).

The simulations exploit third order spatial polynomials and an explicit fourth order low storage Runge-Kutta time discretization scheme. Perfectly matched layers mimic the infinite open space and truncate the tetrahedral mesh. A total field/scattered field formulation permits the evaluation of the scattering cross-section.

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer.

All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

February 06, 2017, at 04:38 PM by 138.96.200.15 -

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More details

February 05, 2017, at 11:14 PM by 82.228.254.112 -

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First review meeting and workshop of the project\\ January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée

to:

First review meeting and workshop of the HPC4E project
January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/hpce_meeting_jan_2017.jpeg

First review meeting and workshop of the project (January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée).\\\

to:

http://www-sop.inria.fr/nachos/pics/news/2017/jan/hpce_meeting_jan_2017.jpeg

First review meeting and workshop of the project\\ January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée

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(:linebreaks:)

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/hpce_meeting_jan_2017.jpeg | First review meeting and workshop of the project (January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée).\\\

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/hpce_meeting_jan_2017.jpeg

First review meeting and workshop of the project (January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée).\\\

February 05, 2017, at 11:09 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/hpce_meeting_jan_2017.jpeg | First review meeting and workshop of the project (January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée).\\\

to:

http://www-sop.inria.fr/nachos/pics/news/2017/jan/hpce_meeting_jan_2017.jpeg | First review meeting and workshop of the project (January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée).\\\

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/hpce_meeting_jan_2017.jpeg | First review meeting and workshop of the project (January 30-February 2, 2017 - Inria Sophia Antipolis-Méidterranée).\\\

February 05, 2017, at 11:02 PM by 82.228.254.112 -

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New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

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New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

February 05, 2017, at 11:01 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case.\\\

to:

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case (DGTD-ce: centered flux DGTD solver - DGTD-up: upwind flux DGTD solver).\\\

February 05, 2017, at 11:00 PM by 82.228.254.112 -

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All simulations have been performed with a dedicated DGDT solver developed in the framework of the https://diogenes.inria.fr/ DIOGENeS software suite.

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All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

February 05, 2017, at 10:59 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer.\\\

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer.\\\

February 05, 2017, at 10:58 PM by 82.228.254.112 -

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All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

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All simulations have been performed with a dedicated DGDT solver developed in the framework of the https://diogenes.inria.fr/ DIOGENeS software suite.

February 05, 2017, at 10:55 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Figure 1. Dimer sphere setup and sketched of incident plane wave.

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Figure 1. Dimer sphere setup and sketched of incident plane wave.

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer.\\\

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer.\\\

February 05, 2017, at 10:55 PM by 82.228.254.112 -

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Figure 2 shows the resulting scattering cross-sections for the local and non-local dispersion model. A comparison of two numerical fluxes, i.e. centered fluxes and upwind fluxes is provided on this figure.

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Figure 2 shows the resulting scattering cross-sections for the local and non-local dispersion model. A comparison of two numerical fluxes, i.e. centered fluxes and upwind fluxes is provided on this figure. The simulations exploit third order spatial polynomials and an explicit fourth order low storage Runge-Kutta time discretization scheme. Perfectly matched layers mimic the infinite open space and truncate the tetrahedral mesh. A total field/scattered field formulation permits the evaluation of the scattering cross-section.

to:

The simulations exploit third order spatial polynomials and an explicit fourth order low storage Runge-Kutta time discretization scheme. Perfectly matched layers mimic the infinite open space and truncate the tetrahedral mesh. A total field/scattered field formulation permits the evaluation of the scattering cross-section.

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February 05, 2017, at 10:53 PM by 82.228.254.112 -

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Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis. All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

to:

Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis.

Changed lines 40-43 from:

Figure 2 shows the resulting scattering cross-sections for the local and non-local dispersion model. A comparison of two numerical fluxes, i.e. centered fluxes and upwind fluxes is provided on this figure. The simulations exploit third order spatial polynomials and an explicit fourth order low storage Runge-Kutta time discretization scheme. Perfectly matched layers mimic the infinite open space and truncate the tetrahedral mesh as shown in Figure 3. A total field/scattered field formulation permits the evaluation of the scattering cross-section.

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer. Red: metal, green: total field region, gold: scattered field region.

to:

Figure 2 shows the resulting scattering cross-sections for the local and non-local dispersion model. A comparison of two numerical fluxes, i.e. centered fluxes and upwind fluxes is provided on this figure. The simulations exploit third order spatial polynomials and an explicit fourth order low storage Runge-Kutta time discretization scheme. Perfectly matched layers mimic the infinite open space and truncate the tetrahedral mesh. A total field/scattered field formulation permits the evaluation of the scattering cross-section.

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer.

All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

February 05, 2017, at 10:52 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case.

to:

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case.

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_mesh.png | Figure 3. Tetrahedral mesh of the sphere dimer. Red: metal, green: total field region, gold: scattered field region. \\\

February 05, 2017, at 10:50 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case.

Changed line 42 from:

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case.\\

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February 05, 2017, at 10:49 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Dimer sphere setup and sketched of incident plane wave.

to:

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Figure 1. Dimer sphere setup and sketched of incident plane wave.

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_scat.png | Figure 2. Logarithmic scattering cross-section of the sphere dimer (kz,Ex). Both material models show the same resonances. However, we observe a significant blue shift in the nonlocal case.

February 05, 2017, at 10:48 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Dimer sphere setup and sketched of incident plane wave.

to:

http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Dimer sphere setup and sketched of incident plane wave.\\

February 05, 2017, at 10:47 PM by 82.228.254.112 -

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http://www-sop.inria.fr/nachos/pics/news/2017/jan/nano_sphere_setup.png | Dimer sphere setup and sketched of incident plane wave.

February 05, 2017, at 10:45 PM by 82.228.254.112 -

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Highlight of the month

to:

Highlight of the month\\

February 05, 2017, at 10:45 PM by 82.228.254.112 -

Changed lines 27-28 from:

Highlight of the month

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Highlight of the month

Changed lines 32-33 from:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).\\\

to:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).

February 05, 2017, at 10:44 PM by 82.228.254.112 -

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February 05, 2017, at 10:44 PM by 82.228.254.112 -

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Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model\\

to:

Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

February 05, 2017, at 10:43 PM by 82.228.254.112 -

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New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

to:

New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model\\

February 05, 2017, at 10:43 PM by 82.228.254.112 -

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Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

to:

Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

Changed lines 31-32 from:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).

to:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).\\\

February 05, 2017, at 10:42 PM by 82.228.254.112 -

Changed lines 31-33 from:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).
Combining length dimensions in a range less than 100 nm and electromagnetic wavelengths in the optical regime requires an appropriate material model for the metal, i.e. perfectly conducting (PEC) assumption as in the microwave regime is not valid anymore du to the relatively large skin-depth. Well-known dispersion models are e.g. local Drude and Drude-Lorentz dispersion models that have been comprehensively studied in the last decades. If geometric details of the structure under investigation approach length dimensions below approximately 25 nm (this value strongly depends on the material model and the actual geometry), spatial dispersion, i.e. the non-local response of the electron gas significantly increases its influence.
Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis. All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.\\

to:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).

Combining length dimensions in a range less than 100 nm and electromagnetic wavelengths in the optical regime requires an appropriate material model for the metal, i.e. perfectly conducting (PEC) assumption as in the microwave regime is not valid anymore du to the relatively large skin-depth. Well-known dispersion models are e.g. local Drude and Drude-Lorentz dispersion models that have been comprehensively studied in the last decades. If geometric details of the structure under investigation approach length dimensions below approximately 25 nm (this value strongly depends on the material model and the actual geometry), spatial dispersion, i.e. the non-local response of the electron gas significantly increases its influence.

Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis. All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

February 05, 2017, at 10:30 PM by 82.228.254.112 -

Changed lines 31-36 from:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).

Combining length dimensions in a range less than 100 nm and electromagnetic wavelengths in the optical regime requires an appropriate material model for the metal, i.e. perfectly conducting (PEC) assumption as in the microwave regime is not valid anymore du to the relatively large skin-depth. Well-known dispersion models are e.g. local Drude and Drude-Lorentz dispersion models that have been comprehensively studied in the last decades. If geometric details of the structure under investigation approach length dimensions below approximately 25 nm (this value strongly depends on the material model and the actual geometry), spatial dispersion, i.e. the non-local response of the electron gas significantly increases its influence.

Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis. All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

to:

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).
Combining length dimensions in a range less than 100 nm and electromagnetic wavelengths in the optical regime requires an appropriate material model for the metal, i.e. perfectly conducting (PEC) assumption as in the microwave regime is not valid anymore du to the relatively large skin-depth. Well-known dispersion models are e.g. local Drude and Drude-Lorentz dispersion models that have been comprehensively studied in the last decades. If geometric details of the structure under investigation approach length dimensions below approximately 25 nm (this value strongly depends on the material model and the actual geometry), spatial dispersion, i.e. the non-local response of the electron gas significantly increases its influence.
Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis. All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.\\

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News - January 2017

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New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model\\

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New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

We study an elementary nanophotonic setup that consists of two metal nanospheres. Positioning these two spheres as depicted in Figure 1 leads to a strongly coupled nanosphere dimer if the gap size undershoots the sphere’s radius. Such configurations are well known to show extreme field enhancements in the vicinity of the gap (the term gap is used for the area where the spheres are closest).

Combining length dimensions in a range less than 100 nm and electromagnetic wavelengths in the optical regime requires an appropriate material model for the metal, i.e. perfectly conducting (PEC) assumption as in the microwave regime is not valid anymore du to the relatively large skin-depth. Well-known dispersion models are e.g. local Drude and Drude-Lorentz dispersion models that have been comprehensively studied in the last decades. If geometric details of the structure under investigation approach length dimensions below approximately 25 nm (this value strongly depends on the material model and the actual geometry), spatial dispersion, i.e. the non-local response of the electron gas significantly increases its influence.

Our simulation results show a non-negligible blue shift in the scattering cross-section spectrum if non-locality is taken into account. For this simulation, we have used gold spheres with a radius of 20 nm and a gap size of 2 nm. The incident plane wave is parallel to the z-axis and its electric field is polarized parallel to the x-axis. All simulations have been performed with a dedicated DGDT solver developed in the framework of the DIOGENeS software suite.

Figure 2 shows the resulting scattering cross-sections for the local and non-local dispersion model. A comparison of two numerical fluxes, i.e. centered fluxes and upwind fluxes is provided on this figure. The simulations exploit third order spatial polynomials and an explicit fourth order low storage Runge-Kutta time discretization scheme. Perfectly matched layers mimic the infinite open space and truncate the tetrahedral mesh as shown in Figure 3. A total field/scattered field formulation permits the evaluation of the scattering cross-section.

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Latest news

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(:linebreaks:) Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model\\

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Master internship - Efficient finite element type solvers for the numerical modeling of nanoscale light/matter interaction

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Master internship - Efficient finite element type solvers for the numerical modeling of nanoscale light/matter interaction

PhD project - Numerical modeling of light diffusion in nanostructured optical fibers

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January 2017\\

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Open positions

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Master internship - Efficient finite element type solvers for the numerical modeling of nanoscale light/matter interaction

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Master internship Advanced computational modeling of silicon waveguide devices

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Master internship - Advanced computational modeling of silicon waveguide devices

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Master internship Advanced computational modeling of silicon waveguide devices

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Job offers

Master internship Advanced computational modeling of silicon waveguide devices based on Sub-Wavelength Gratings

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Latest news

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Our research activities are concerned with the design, analysis and high performance implementation of numerical methods for the simulation of the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.

High order discretization methods

We concentrate our efforts on finite element type methods belonging to the family of Discontinuous Galerkin (DG) methods. DG methods are at the heart of the activities of the team regarding the development of high order discretization schemes for the differential systems modeling time-domain and time-harmonic electromagnetic and elastodynamic wave propagation. We currently study three variants of DG methods: (1) DG methods for time-domain problems, (2) hybridizable DG (HDG) methods for time-domain and time-harmonic problems and (3) multiscale DG methods for time-domain problems.

Efficient time integration strategies

The use of unstructured meshes in conjunction with high order DG discretization methods for time-domain problems (so-called DGTD methods) is appealing for dealing with complex geometries and heterogeneous propagation media. Moreover, DG discretization methods are naturally adapted to local, conforming as well as non-conforming, refinement of the underlying mesh. Most of the existing DGTD methods rely on explicit time integration schemes and lead to block diagonal mass matrices which is often recognized as one of the main advantages with regards to continuous finite element methods. However, explicit DGTD methods are also constrained by a stability condition that can be very restrictive on highly refined meshes and when the local approximation relies on high order polynomial interpolation. In this context, we study accurate and efficient strategies combining explicit and implicit time integration schemes.

Numerical treatment of complex material models

Towards the general aim of being able to consider concrete physical situations, we are interested in taking into account in the numerical methodologies that we study, a better description of the propagation of waves in realistic media. For example, in the context of DGTD formulations for electromagnetic wave propagation models, we study the numerical treatment of local and non-local dispersion models.

Applications

Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising innovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics. Recent achievements and sample results are described here.

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Our research activities are concerned with the design, analysis and high performance implementation of numerical methods for the simulation of the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.

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Our research activities are concerned with the design, analysis and high performance implementation of numerical methods for the simulation of the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.\\\

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The use of unstructured meshes (based on triangles in two space dimensions and tetrahedra in three space dimensions) in conjunction with high order discretization methods for time-domain problems (e.g. nodal DGTD formulations) is appealing for dealing with complex geometries and heterogeneous propagation media. Moreover, DG-like discretization methods are naturally adapted to local, conforming as well as non-conforming, refinement of the underlying mesh. Most of the existing DGTD methods rely on explicit time integration schemes and lead to block diagonal mass matrices which is often recognized as one of the main advantages with regards to continuous finite element methods. However, explicit DGTD methods are also constrained by a stability condition that can be very restrictive on highly refined meshes and when the local approximation relies on high order polynomial interpolation. In this context, we study accurate and efficient strategies combining explicit and implicit time integration schemes.

to:

The use of unstructured meshes in conjunction with high order DG discretization methods for time-domain problems (so-called DGTD methods) is appealing for dealing with complex geometries and heterogeneous propagation media. Moreover, DG discretization methods are naturally adapted to local, conforming as well as non-conforming, refinement of the underlying mesh. Most of the existing DGTD methods rely on explicit time integration schemes and lead to block diagonal mass matrices which is often recognized as one of the main advantages with regards to continuous finite element methods. However, explicit DGTD methods are also constrained by a stability condition that can be very restrictive on highly refined meshes and when the local approximation relies on high order polynomial interpolation. In this context, we study accurate and efficient strategies combining explicit and implicit time integration schemes.

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via the J.A. Dieudonné Mathematics Laboratory (UMR 7351)\\\

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via the J.A. Dieudonné Mathematics Laboratory (UMR 7351).\\\

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We concentrate our efforts on finite element type methods belonging to the family of Discontinuous Galerkin (DG) methods. DG methods are at the heart of the activities of the team regarding the development of high order discretization schemes for the differential systems modeling time-domain and time-harmonic electromagnetic and elastodynamic wave propagation. We currently study three variants of DG methods: (1) nodal DG methods for time-domain problems, (2) hybridizable DG (HDG) methods for time-domain and time-harmonic problems and (3) multiscale DG methods for time-domain problems.

to:

We concentrate our efforts on finite element type methods belonging to the family of Discontinuous Galerkin (DG) methods. DG methods are at the heart of the activities of the team regarding the development of high order discretization schemes for the differential systems modeling time-domain and time-harmonic electromagnetic and elastodynamic wave propagation. We currently study three variants of DG methods: (1) DG methods for time-domain problems, (2) hybridizable DG (HDG) methods for time-domain and time-harmonic problems and (3) multiscale DG methods for time-domain problems.

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Our research activities are concerned with the design, analysis and high performance implementation of computational tools for modeling the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.\\\

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Our research activities are concerned with the design, analysis and high performance implementation of numerical methods for the simulation of the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.\\\

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Joint project-team between Inria, CNRS and the University of Nice/Sophia Antipolis\\

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Nachos is a joint project-team between Inria, CNRS and the University of Nice/Sophia Antipolis\\

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Applications\\

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Applications

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cEfficient time integration strategies

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Efficient time integration strategies

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Numerical treatment of complex material models\\

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Numerical treatment of complex material models

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Efficient time integration strategies\\

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cEfficient time integration strategies

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High order discretization methods

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High order discretization methods

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High order discretization methods

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High order discretization methods

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High order discretization methods\\

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics. Recent achievements and sample results are described here.

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising innovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics. Recent achievements and sample results are described here.

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Joint project-team between Inria, the CNRS and the University of Nice/Sophia Antipolis\\

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Our research activities are concerned with the design, analysis and high performance implementation of computational tools for modeling the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.\\\

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Our research activities are concerned with the design, analysis and high performance implementation of computational tools for modeling the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.

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Our research activities are concerned with the design, analysis and high performance implementation of computational tools for modeling the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.

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via the J.A. Dieudonné Mathematics Laboratory (UMR 7351)\\

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via the J.A. Dieudonné Mathematics Laboratory (UMR 7351)\\\

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Our research activities are concerned with the design, analysis and high performance implementation of computational tools for modeling the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.
Joint project-team between Inria, the CNRS and the University of Nice/Sophia Antipolis
via the J.A. Dieudonné Mathematics Laboratory (UMR 7351)\\

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics. Recent achievements and sample results are availble here.

http://www-sop.inria.fr/nachos/pics/results/nano_sphere/nano_sphere-mesh.jpg Tetrahedral mesh for plasmonic resonance of a gold nanosphere. The scatterer (in red) is enclosed by the total field (TF) region (in blue), delimited by the TF/SF interface on which the incident field is imposed. Then we find the scattered field (SF) region (in purple), surrounded by UPMLs (in gray).

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics. Recent achievements and sample results are described here.

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics.

to:

Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics. Recent achievements and sample results are availble here.

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http://www-sop.inria.fr/nachos/pics/results/nano_sphere/nano_sphere-mesh.jpg Tetrahedral mesh for plasmonic resonance of a gold nanosphere. The scatterer (in red) is enclosed by the total field (TF) region (in blue), delimited by the TF/SF interface on which the incident field is imposed. Then we find the scattered field (SF) region (in purple), surrounded by UPMLs (in gray).

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http://www-sop.inria.fr/nachos/pics/results/nano_sphere/nano_sphere-mesh.jpg The image is left-aligned, and the text wraps on the right side of the image. The text after the [[<<]] markup continues below the image.

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http://www-sop.inria.fr/nachos/pics/results/nano_sphere/nano_sphere-mesh.jpg The image is left-aligned, and the text wraps on the right side of the image. The text after the [[<<]] markup continues below the image.
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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics/nanoplasmonics.

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics.

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on problems pertaining to nanophotonics/nanoplasmonics. More precisely, we aim at proposing innovative numerical methodologies for the numerical simulation of light interaction with matter on the nanoscale.

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on devising nnovative numerical methodologies for the simulation of problems involving waves interacting with matter structured at the nanoscale. As a first step in this direction we consider applications pertaining to nanophotonics/nanoplasmonics.

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From the point of view of applications, since 2012, we concentrate our efforts on problems pertaining to nanophotonics/nanoplasmonics, i.e., on the numerical modeling of light interaction with nanoscale structures. In this context, our general objective is to propose innovative numerical methodologies for the solution of the system of (time-domain and time-harmonic) Maxwell equations coupled to appropriate models of the materials/structures with which the electromagnetic wave interacts.

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Although our methodological contributions are in theory applicable to a wide panel of applications in electromagnetics and elastodynamics, we currently concentrate our efforts on problems pertaining to nanophotonics/nanoplasmonics. More precisely, we aim at proposing innovative numerical methodologies for the numerical simulation of light interaction with matter on the nanoscale.

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Towards the general aim of being able to consider concrete physical situations, we are interested in taking into account in the numerical methodologies that we study, a better description of the propagation of waves in realistic media. For example, in the context of DGTD formulations for electromagnetic wave propagation models, we study the numerical treatment of local and non-local dispersion models.

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Towards the general aim of being able to consider concrete physical situations, we are interested in taking into account in the numerical methodologies that we study, a better description of the propagation of waves in realistic media. For example, in the context of DGTD formulations for electromagnetic wave propagation models, we study the numerical treatment of local and non-local dispersion models.

Applications
From the point of view of applications, since 2012, we concentrate our efforts on problems pertaining to nanophotonics/nanoplasmonics, i.e., on the numerical modeling of light interaction with nanoscale structures. In this context, our general objective is to propose innovative numerical methodologies for the solution of the system of (time-domain and time-harmonic) Maxwell equations coupled to appropriate models of the materials/structures with which the electromagnetic wave interacts.

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High order discretization methods

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High order discretization methods\\

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Efficient time integration strategies

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Efficient time integration strategies\\

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Numerical treatment of complex material models

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Numerical treatment of complex material models\\

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Welcome to PmWiki!

A local copy of PmWiki's documentation has been installed along with the software, and is available via the documentation index.

To continue setting up PmWiki, see initial setup tasks.

The basic editing page describes how to create pages in PmWiki. You can practice editing in the wiki sandbox.

More information about PmWiki is available from http://www.pmwiki.org.

to:

Welcome to the Nachos team homepage!

Our research activities are concerned with the design, analysis and high performance implementation of computational tools for modeling the interaction of waves (electromagnetic waves and elastic waves) with complex media and irregularly shaped structures.

High order discretization methods We concentrate our efforts on finite element type methods belonging to the family of Discontinuous Galerkin (DG) methods. DG methods are at the heart of the activities of the team regarding the development of high order discretization schemes for the differential systems modeling time-domain and time-harmonic electromagnetic and elastodynamic wave propagation. We currently study three variants of DG methods: (1) nodal DG methods for time-domain problems, (2) hybridizable DG (HDG) methods for time-domain and time-harmonic problems and (3) multiscale DG methods for time-domain problems.

Efficient time integration strategies The use of unstructured meshes (based on triangles in two space dimensions and tetrahedra in three space dimensions) in conjunction with high order discretization methods for time-domain problems (e.g. nodal DGTD formulations) is appealing for dealing with complex geometries and heterogeneous propagation media. Moreover, DG-like discretization methods are naturally adapted to local, conforming as well as non-conforming, refinement of the underlying mesh. Most of the existing DGTD methods rely on explicit time integration schemes and lead to block diagonal mass matrices which is often recognized as one of the main advantages with regards to continuous finite element methods. However, explicit DGTD methods are also constrained by a stability condition that can be very restrictive on highly refined meshes and when the local approximation relies on high order polynomial interpolation. In this context, we study accurate and efficient strategies combining explicit and implicit time integration schemes.

Numerical treatment of complex material models Towards the general aim of being able to consider concrete physical situations, we are interested in taking into account in the numerical methodologies that we study, a better description of the propagation of waves in realistic media. For example, in the context of DGTD formulations for electromagnetic wave propagation models, we study the numerical treatment of local and non-local dispersion models.

March 25, 2015, at 10:22 AM by 138.96.201.175 -

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News - February 2017

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Highlight of the month

Highlight of the month

Highlight of the month

Highlight of the monthNew DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model\\

Highlight of the monthNew DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

Highlight of the monthNew DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

News - January 2017

News - January 2017

News - January 2017

Latest news

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Open positions

Job offers

Latest news

High order discretization methods

Efficient time integration strategies

Numerical treatment of complex material models

Applications

Applications

cEfficient time integration strategies

Efficient time integration strategies

Numerical treatment of complex material models

cEfficient time integration strategies

High order discretization methods

High order discretization methods

High order discretization methods

High order discretization methods

High order discretization methods

High order discretization methods

High order discretization methods\\

High order discretization methods

High order discretization methods\\

Welcome to the Nachos team homepage!\\

Welcome to the Nachos team homepage!\\\

Welcome to the Nachos team homepage!

Welcome to the Nachos team homepage!\\

Welcome to the Nachos team homepage!

Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model\\

Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model

Highlight of the month
New DGTD solver for the 3D time-domain Maxwell equations coupled to a linearized non-local Drude model