0000000000918206

AUTHOR

Alfonso C. Cino

showing 2 related works from this author

Transient guided-mode resonance metasurfaces with phase-transition materials

2023

We investigate transient, photo-thermally induced metasurface effects in a planar thin-film multilayer based on a phase-transition material. Illumination of a properly designed multilayer with two obliquely incident and phase-coherent pulsed pumps induces a transient and reversible temperature pattern in the phase-transition layer. The deep periodic modulation of the refractive index, caused by the interfering pumps, produces a transient Fano-like spectral feature associated with a guided-mode resonance. A coupled opto-thermal model is employed to analyze the temporal dynamics of the transient metasurface and to evaluate its speed and modulation capabilities. Using near-infrared pump pulses…

guided modemetasurfacephotonicvanadium dioxidetransient gratingSettore ING-INF/02 - Campi Elettromagneticiphase change materialAtomic and Molecular Physics and OpticsOptics Letters
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Second order nonlinear optics in AlGaAs metasurfaces

2023

Recently, nonlinear optics at the nanoscale level has emerged as a promising branch of nanophotonics. In this work, we focus our attention on Aluminum Gallium Arsenide (AlGaAs) nanoantennas and metasurfaces for efficient and controlled second harmonic photon emission. After a brief introduction concerning the main studies in this field, we present the latest results achieved in AlGaAs platforms both in the lossless and absorption regimes.

metasurfaceNanophotonicsecond harmonic generationnonlinear opticSettore ING-INF/02 - Campi Elettromagnetici
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