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Light scattering by optical nanoantennas

Results.DGTDOptical-nanoantenna History

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April 24, 2015, at 04:04 PM by 138.96.201.175 -
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This study is conducted in collaboration with Dr. Maciej Klemm, Department of Electrical and Electric Engineering, University of Bristol, UK.
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This study is conducted in collaboration with Maciej Klemm, Department of Electrical and Electric Engineering, University of Bristol, UK.
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April 24, 2015, at 04:01 PM by 138.96.201.175 -
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(:title Light scattering by optical nanoantennas:)
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April 24, 2015, at 02:15 PM by 138.96.201.175 -
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April 24, 2015, at 02:14 PM by 138.96.201.175 -
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April 24, 2015, at 02:14 PM by 138.96.201.175 -
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April 24, 2015, at 02:13 PM by 138.96.201.175 -
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%center% Design of a single antenna element: influence of teh curvature
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%center% Design of a single antenna element: influence of the curvature
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April 24, 2015, at 02:13 PM by 138.96.201.175 -
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%center% Design of a single antenna element. We study the influence of the shape on the behavior of a core nanoantenna element in order to anticipate  the consequences of the mismatch between the theoretical and effective (i.e. resulting from the fabrication process) geometrical designs.
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%center% Design of a single antenna element: influence of teh curvature
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We study the influence of the shape on the behavior of a core nanoantenna element in order to anticipate  the consequences of the mismatch between the theoretical and effective (i.e. resulting from the fabrication process) geometrical designs.

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%center% DGTD simulation of an antenna array: cattered field pattern.
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%center% DGTD simulation of an antenna array: scattered field pattern
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April 24, 2015, at 02:12 PM by 138.96.201.175 -
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%center% DGTD simulation of an antenna array: cattered field pattern.
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April 24, 2015, at 02:07 PM by 138.96.201.175 -
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%center% Design of a single antenna element. We study the influence of the geometry on the behavior of a core nanoantenna element in order to anticipate  the consequences of the mismatch between the theoretical and effective (i.e. resulting from the fabrication process) geometrical designs.
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%center% Design of a single antenna element. We study the influence of the shape on the behavior of a core nanoantenna element in order to anticipate  the consequences of the mismatch between the theoretical and effective (i.e. resulting from the fabrication process) geometrical designs.
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April 24, 2015, at 02:06 PM by 138.96.201.175 -
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%center% Design of a single antenna element: influence of the curvature
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%center% Design of a single antenna element. We study the influence of the geometry on the behavior of a core nanoantenna element in order to anticipate  the consequences of the mismatch between the theoretical and effective (i.e. resulting from the fabrication process) geometrical designs.
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April 23, 2015, at 05:50 PM by 82.228.254.112 -
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April 23, 2015, at 05:50 PM by 82.228.254.112 -
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April 23, 2015, at 04:25 PM by 138.96.201.175 -
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April 23, 2015, at 04:09 PM by 138.96.201.175 -
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%lfloat text-align=left width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png [[<<]]
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April 23, 2015, at 04:09 PM by 138.96.201.175 -
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The reflectarray consists of an array of equally separated antenna elements.
In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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The reflectarray consists of an array of equally separated antenna elements.  In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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April 23, 2015, at 04:09 PM by 138.96.201.175 -
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%lfloat text-align=left width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. [[<<]]
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%lfloat text-align=left width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png [[<<]]
The reflectarray consists of an array of equally separated antenna elements.
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April 23, 2015, at 04:08 PM by 138.96.201.175 -
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%lfloat text-align=center width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements.
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%lfloat text-align=left width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. [[<<]]
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April 23, 2015, at 04:08 PM by 138.96.201.175 -
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April 23, 2015, at 04:07 PM by 138.96.201.175 -
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%lfloat width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements.
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%lfloat text-align=center width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements.
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April 23, 2015, at 04:06 PM by 138.96.201.175 -
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%lfloat width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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%lfloat width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements.


In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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April 23, 2015, at 04:05 PM by 138.96.201.175 -
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%lfloat text-align=left width=350px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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%lfloat width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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April 23, 2015, at 04:03 PM by 138.96.201.175 -
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%lfloat text-align=right width=350px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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%lfloat text-align=left width=350px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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April 23, 2015, at 04:03 PM by 138.96.201.175 -
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%lfloat text-align=center width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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%lfloat text-align=right width=350px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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April 23, 2015, at 04:03 PM by 138.96.201.175 -
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In the currently realized designs, optical antenna arrays are based on conventional metal or low loss dielectric materials. Utilizing phase change material (PCM), dynamic beam shaping and steering can be achieved with   array structures.  Antenna arrays with dynamic high-speed beam shaping and steering will have a great impact on future micro/nano devices. University of Bristol has recently proposed a tunable reflectarray as a pathway to PCM based optical antenna arrays for free-space inter/intra chip interconnects. The tunable operation is realized by switching between two states of PCM. The difference in refractive index of the amorphous and crystalline state of PCM will change the behavior of the reflectarray. The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity.
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In the currently realized designs, optical antenna arrays are based on conventional metal or low loss dielectric materials. Utilizing phase change material (PCM), dynamic beam shaping and steering can be achieved with array structures.  Antenna arrays with dynamic high-speed beam shaping and steering will have a great impact on future micro/nano devices. University of Bristol has recently proposed a tunable reflectarray as a pathway to PCM based optical antenna arrays for free-space inter/intra chip interconnects. The tunable operation is realized by switching between two states of PCM. The difference in refractive index of the amorphous and crystalline state of PCM will change the behavior of the reflectarray.
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%lfloat text-align=center width=320px% http://www-sop.inria.fr/nachos/pics/results/UoB/2D_reflectarray.png | The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 
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April 23, 2015, at 04:00 PM by 138.96.201.175 -
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April 23, 2015, at 03:46 PM by 138.96.201.175 -
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%center% Nanoantenna design : influence of the curvature
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%center% Design of a single antenna element: influence of the curvature

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%center% Influnece of the curvature
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%center% Nanoantenna design : influence of the curvature
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%center% Module of the Fourier transformed field plot of E'_x_' computed with the DGTD-P'_2_' method
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%center% Module of the Fourier transformed field plot of E'_x_' computed with the DGTD-P'_2_' method
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In the currently realized designs, optical antenna arrays are based on conventional metal or low loss dielectric materials. Utilizing phase change material (PCM), dynamic beam shaping and steering can be achieved with  array structures.  Antenna arrays with dynamic high-speed beam shaping and steering will have a great impact on future micro/nano devices. University of Bristol has recently proposed a tunable reflectarray as a pathway to PCM based optical antenna arrays for free-space inter/intra chip interconnects. The tunable operation is realized by switching between two states of PCM. The difference in refractive index of the amorphous and crystalline state of PCM will change the behavior of the reflectarray. The reflectarray consists of an array of equally separated antenna elements. In one state of PCM, antenna elements are designed to provide a constant phase gradient along the interface.  It modifies the wavefront of incident light by altering its phase in a desired manner.  The gradient of phase shift generates an effective wavevector along the interface, which is able to deflect light from specular reflection, described by the generalized Snell's law.  In another state of PCM, the gradient phase shift is disturbed due to the significant chance of material’s permittivity. 

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April 06, 2015, at 08:30 PM by 82.228.254.112 -
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This study is conducted in collaboration with Dr. Maciej Klemm, Department of Electrical and Electric Engineering, University of Bristol, UK.

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Optical  antennas and  antenna  arrays  offer possibilities  in manipulating light  at sub-wavelength scale.  Similar  to their counterparts at microwave frequencies, optical antenna arrays offer the capability of beam shaping and steering through controlling the phase of each antenna element. The phase control of optical antenna arrays can be implemented by either delay lines or antenna geometry and location. Identical antennas with uniform lattice are usually utilized when delay lines are employed to adjust the phase of antennas. Although sophisticated antenna design and arrangement can be avoided, delay lines are space consuming and difficult to integrate. Without using delay lines, antenna elements have to be carefully designed to obtain the required phase by taking into account the geometry, arrangement, coupling between elements and micro/nano fabrication tolerance.
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