6533b7d8fe1ef96bd1269b2c

RESEARCH PRODUCT

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

Kirill I. OkhlopkovAttilio ZilliAndrea TognazziDavide RoccoLuca FagianiErfan MafakheriMonica BollaniMarco FinazziMichele CelebranoMaxim R. ShcherbakovCostantino De AngelisAndrey A. Fedyanin

subject

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

description

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 (-1,0) THG diffraction orders from 1:6 for off-resonant excitation to 129:1 for the hybrid mode excitation, showing tremendous contrast in controlling the nonlinear diffraction patterns. Our results pave the way to the realization of metasurfaces for novel light sources, telecommunications, and quantum photonics.

10.1021/acs.nanolett.1c03790http://hdl.handle.net/11379/561616