Search results for "high-Q metasurface"

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Tailoring Third-Harmonic Diffraction Efficiency by Hybrid Modes in High-Q Metasurfaces

2021

Metasurfaces are versatile tools for manipulating light; however, they have received little attention as devices for the efficient control of nonlinearly diffracted light. Here, we demonstrate nonlinear wavefront control through third-harmonic generation (THG) beaming into diffraction orders with efficiency tuned by excitation of hybrid Mie-quasi-bound states in the continuum (BIC) modes in a silicon metasurface. Simultaneous excitation of the high-Q collective Mie-type modes and quasi-BIC modes leads to their hybridization and results in a local electric field redistribution. We probe the hybrid mode by measuring far-field patterns of THG and observe the strong switching between (0,-1) and…

bound states in the continuumMechanical Engineeringall-dielectric metasurface bound states in the continuum high-Q metasurface hybrid mode Third-harmonic diffraction wavefront controlhybrid modeBioengineeringSettore ING-INF/02 - Campi Elettromagnetici02 engineering and technologyGeneral Chemistryhigh-Q metasurface021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural scienceswavefront controlall-dielectric metasurface0103 physical sciencesThird-harmonic diffractionThird-harmonic diffraction; all-dielectric metasurface; bound states in the continuum; high-Q metasurface; hybrid mode; wavefront controlGeneral Materials Science010306 general physics0210 nano-technology
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