132 citations · 1.1k across the 51 of their papers we have counts for
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Efficient vortex generation in sub-wavelength epsilon-near-zero slabs
Alessandro Ciattoni, Andrea Marini, Carlo Rizza
We show that a homogeneous and isotropic slab, illuminated by a circularly polarized beam with no topological charge, produces vortices of order two in the opposite circularly pola…
Extrinsic electromagnetic chirality in all-photodesigned one-dimensional THz metamaterials
Carlo Rizza, Lorenzo Columbo, Massimo Brambilla +2
We suggest that all-photodesigned metamaterials, sub-wavelength custom patterns of photo-excited carriers on a semiconductor, can display an exotic extrinsic electromagnetic chiral…
All-optical modulation in wavelength-sized epsilon-near-zero media
Alessandro Ciattoni, Andrea Marini, Carlo Rizza
We investigate the interaction of two pulses (pump and probe) scattered by a nonlinear epsilon-near-zero (ENZ) slab whose thickness is comparable with the ENZ wavelength. We show t…
Separable metamaterials: analytical ab-initio homogenization and chirality
Alessandro Ciattoni, Domenico Rago, Carlo Rizza
We investigate the ab-initio homogenization of separable metamaterials with factorized dielectric permittivity profile which can be achieved through suitable grey-scale permittivit…
Optically induced metal-to-dielectric transition in Epsilon-Near-Zero metamaterials
R. M. Kaipurath, M. Pietrzyk, L. Caspani +6
Epsilon-Near-Zero materials exhibit a transition in the real part of the dielectric permittivity from positive to negative value as a function of wavelength. Here we study metal-di…