Silicon metasurfaces with bound states in the continuum for high-harmonic generation
Date
2021
Authors
Koshelev, K.
Zograf, G.
Korolev, V.
Zalogina, A.
Choi, D.Y.
Hollinger, R.
Luther-Davies, B.
Zürch, M.
Kartashov, D.
Spielmann, C.
Editors
Bertolotti, M.
Zayats, A.V.
Zheltikov, A.M.
Zayats, A.V.
Zheltikov, A.M.
Advisors
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Conference paper
Citation
Proceedings of SPIE, 2021 / Bertolotti, M., Zayats, A.V., Zheltikov, A.M. (ed./s), vol.11770, pp.11770 - 1-11770 - 4
Statement of Responsibility
Kirill Koshelev, George Zografb, Viacheslav Korolevc, Anastasia Zaloginaa, Duk-Yong Choid, Richard Hollingerc, Barry Luther-Daviesd, Michael Zürchc, Daniil Kartashovc, Christian Spielmannc, Sergey Makarovb, Sergey Kruka, and Yuri Kivshar
Conference Name
Nonlinear Optics and Applications XII (19 Apr 2021 - 30 Apr 2021 : Virtual)
Abstract
Bound states in the continuum (BICs) represent dark modes trapped in the radiation continuum. BICs received significant attention in optics and photonics as a simple tool to achieve giant quality factors by transforming them into quasi-BICs. Here, we report the observation of high-harmonic generation in dielectric metasurfaces hosting BICs. The metasurface is composed of a square lattice with parallel Si bars of a slightly different width placed on a transparent substrate. The structure is engineered to support a quasi-BIC in the mid-IR with a high quality factor. We tune the metasurface asymmetry to enable the optimal coupling condition that provide the highest high-harmonic generation efficiency. In the experiment, we demonstrate the generation of odd optical harmonics from the 3rd to the 11th order in the BIC regime and study their polarization dependence. We measure the dependence of the high-harmonic signal on the input intensity. The concept of metasurfaces with highly localized light boosted by BIC resonances provides a new degree of freedom to control experimentally strong nonlinear optical response.
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© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.