Description du sujet de thèse

“This PhD project aims to model and analyze photonic nanostructures in order to optimize their optical response. Particular attention will be given to coupled dielectric nanoparticles capable of supporting Mie resonances. We will model their electromagnetic responses and optimize their parameters to (i) enhance the electric-field intensity within the dielectric material, and (ii) control the scattering spectrum.

The first objective of this work is to implement modeling methods for the electromagnetic properties of coupled dielectric photonic nanostructures and to identify the parameters that lead to internal field maxima based on Mie resonances. Using the far-field spectral response, we will also aim to predict the frequency range for which the internal field enhancement is maximal.

The second objective is to develop an inverse-design method based on the analysis of singularities in the complex-frequency plane of the response functions of optical nanostructures. The innovative idea is to optimize the spectral response of the structure by analyzing the distribution of complex singularities. We will develop deep-learning methods to optimize the spectral optical response within this framework. This approach will be combined with numerical techniques already available in the laboratory for computing scattering matrices of optical nanostructures, such as RCWA, differential methods, or multipolar methods.

The nanostructures modeled and optimized during this PhD project will be fabricated and experimentally characterized in collaboration with the scientific partners of the host group.

Required skills:
The successful candidate should have a strong background and expertise in numerical photonics, numerical modeling, and theoretical photonics. Experience with Matlab, Python, FORTRAN/C/C++, LaTeX, and other relevant software tools will be appreciated.

Contexte de travail

The project will be carried out at the Institut Fresnel in Marseille, France (https://www.fresnel.fr/

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.