In the recent years the concept of metasurface has progressively emerged as a revolutionary means to manipulate the behavior of light at the nanoscale. These devices are nanostructured two-dimensional materials offering unprecedented control over the optical properties of light, leading to previously unattainable applications in flat lenses, holographic imaging, and emission control among others. The design of nanophotonics based optical components involves complex light matter interaction at nanoscale, in regimes for which the crude ray optics approximation does not hold, thus requiring advanced numerical modeling methods. Among those different methods, inverse design approaches have recently been reported to be effective solutions for achieving highly efficient and rather robust optical performances.
We propose an inverse design methodology that couples the Efficient Global Optimization method with a DGTD solver to achieve a metasurface that enhances second harmonic generation. This study is conducted in collaboration with the group of Giuseppe Leo at the Materials and Quantum Phenomena Laboratory (MPQ, CNRS), Université Paris Cité.