Conference Agenda

This presentation is about the generalized laws of reflection and refraction for metasurfaces. We discuss in detail their derivation starting from questioning the original proof. We discuss two families of metasurfaces, namely refractive metasurfaces, made of a refractive layer with position-dependent optical index and diffractive metasurfaces made of scatterers. We conclude that some generalized Snell-Descartes laws can be defined but they differ from the ones reported in the literature.

Recently, a huge effort has been directed to engineering the radiative properties of an emitter to obtain increasingly efficient photonic sources in the telecom wavelength range.

We investigate the modification of the room temperature luminescence (radiative decay rate and intensity) at λ = 1540 nm from Er3+ ions coupled to different metasurfaces, like Si-based arrays of disk nanoslots or nanostructured phase-change materials (VO2). These exhibit a rich set of high Q-factors modes, which can be effectively coupled to the mixed electric dipole (ED) and magnetic dipole (MD) transitions of Er3+

Optical properties of porous silicon nanowires (NWs) with homogenous lateral dimensions of 90 nm are investigated by Raman scattering experiments along isothermal pressure cycles in a diamond anvil cell. Experiments were performed at variable temperatures up to 400°C and pressures of 30 GPa comparing the bulk Si and porous NWs. Our results evidence that the phase properties are significantly affected by the initial structure, size and shape distribution of the materials especially at low dimension. The exotic phase transitions with distinct properties in Si NWs lead to advanced future applications.