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: Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia; Department of Physics, Politecnico di Milano, 20133 Milano, Italy; Department of Information Engineering, University of Brescia, 25123 Brescia, Italy; CNR-INO (National Institute of Optics), 25123 Brescia, Italy; CNR-IFN, LNESS Laboratory, 22100 Como, Italy; Department of Electrical Engineering and Computer Science, University of California, Irvine, California 92697, United State

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 dell´Istruzione, dell´Universita` 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: 13
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