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

Year: 2021

Authors: Okhlopkov K.I., Zilli A., Tognazzi A., Rocco D., Fagiani L., Mafakheri E., Bollani M., Finazzi M., Celebrano M., Shcherbakov M.R., De Angelis C., Fedyanin A.A.

Autors Affiliation: Lomonosov Moscow State Univ, Fac Phys, Moscow 119991, Russia; Politecn Milan, Dept Phys, I-20133 Milan, Italy; Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; Natl Inst Opt, CNR INO, I-25123 Brescia, Italy; Politecn Milan, Dept Phys, I-20133 Milan, Italy; CNR IFN, LNESS Lab, I-22100 Como, Italy; Univ Calif Irvine, Dept Elect Engn & Comp Sci, Irvine, CA 92697 USA.

Abstract: 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.

Journal/Review: NANO LETTERS

Volume: 21 (24)      Pages from: 10438  to: 10445

More Information: The work was performed under financial support of the Russian Ministry of Education and Science (Grant No. 14.W03.31.0008, numerical calculations) and the Russian Foundation for Basic Research (Grant No. 21-52-12036, sample characterization). K.I. O. thanks MSU Quantum Technology Centre for the support. M.R.S. thanks the Russian Science Foundation (Grant No. 18-12-00475, optical measurements). A.A.F. thanks the Interdisciplinary Scientific and Educational School of Lomonosov Moscow State University, “Photonic and Quantum technologies. Digital medicine”. Part of the work was supported by the European Commission (828890 (FET Open NARCISO), 899673 (FET OpenMETAFAST)); Ministero dellŽIstruzione, dellŽUniversita` e della Ricerca (2017MP7F8F (PRIN project NOMEN)).
KeyWords: all-dielectric metasurface, bound states in the continuum, high-Q metasurface, hybrid mode, Third-harmonic diffraction, wavefront control
DOI: 10.1021/acs.nanolett.1c03790

Citations: 24
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