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## Section: New Results

### Optimization of nano-photonic devices

Participants : Mickaël Binois, Régis Duvigneau, Mahmoud Elsawy [NACHOS team] , Alexis Gobé [NACHOS team] , Stéphane Lanteri [NACHOS team] .

In collaboration with NACHOS Project-Team, we consider the optimization of optical meta-surface devices, which are able to alter light properties by operating at nano-scale. In the contexte of Maxwell equations, modified to account for nano-scale phenomena, the geometrical properties of materials are optimized to achieve a desired electromagnetic wave response, such as change of polarization, intensity or direction. This task is especially challenging due to the computational cost related to the 3D time-accurate simulations and the difficulty to handle the different geometrical scales in optimization.

A first study, comparing an evolution strategy and a Bayesian optimization algorithm, demonstrates the potentiality of the proposed approach [25], [38].