Research

Here are some of my past and current research projects.

Topology optimization

I designed an all-dielectric cloaking device at microwave frequencies using gradient based topology optimization. We study the performances of cloaks optimized for one, two and three frequencies in terms of scattering reduction and correlations with respect to the free space propagation case. Finally, a modal analysis is carried out providing physical insights on the resonant cloaking mechanism at stake.

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Numerical analysis of photonic resonances

I have developed a modal approach based on the finite element method (FEM) adapted to diffractive structures (periodic or not) of arbitrary geometry and material properties, possibly embedded in a multilayer stack. In addition, I showed that it is possible to expand the solution of the problem with sources on a reduced eigenvectors basis.

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Design of metamaterial infrared spectral filters

I have applied FEM based numerical techniques to the design of several bi-periodic structures realizing various filtering functions in the infrared. I took part in the fabrication processes and I experimentally characterized the samples.

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Silicon Mie resonators

We report the capabilities of a dewetting-based process, independent of the sample size, to fabricate Si-based resonators over large scales starting from commercial silicon-on-insulator (SOI) substrates. Spontaneous dewetting is shown to allow the production of monocrystalline Mie-resonators that feature two resonant modes in the visible spectrum, as observed in confocal scattering spectroscopy.

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QED cavities and quasimodes

We describe the absorption by the walls of a quantum electrodynamical cavity as a process during which the elementary excitations (photons) of an internal mode of the cavity exit by tunneling through the cavity walls. We estimate by classical methods the survival time of a photon inside the cavity and the quality factor of its mirrors.

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Transformation optics PML for Wood’s anomalies

We proposed an Adaptive Perfectly Matched Layer (APML) to be used in diffraction grating modeling. With a properly tailored co-ordinate stretching depending both on the incident field and on grating parameters, the APML efficiently absorbs diffracted orders near grazing angles (the so-called Wood’s anomalies).

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