Sum-frequency generation in high-Q GaP metasurfaces driven by leaky-wave guided modes

Camacho-Morales, R, Xu, L ORCID: https://orcid.org/0000-0001-9071-4311, Zhang, H, Ha, ST, Krivitsky, L, Kuznetsov, AI, Rahmani, M ORCID: https://orcid.org/0000-0001-9268-4793 and Neshev, D, 2022. Sum-frequency generation in high-Q GaP metasurfaces driven by leaky-wave guided modes. Nano Letters. ISSN 1530-6984

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Abstract

Resonant metasurfaces provide a unique platform for enhancing multiwave nonlinear interactions. However, the difficulties over mode matching and material transparency place significant challenges in the enhancement of these multiwave processes. Here we demonstrate efficient nonlinear sum-frequency generation (SFG) in multiresonant GaP metasurfaces based on guided-wave bound-state in the continuum resonances. The excitation of the metasurface by two near-infrared input beams generates strong SFG in the visible spectrum with a conversion efficiency of 2.5 × 10–4 W–1, 2 orders of magnitude higher than the one reported in Mie-type resonant metasurfaces. In addition, we demonstrate the nontrivial polarization dependence on the SFG process. In contrast to harmonic generation, the SFG process is enhanced when using nonparallel polarized input-beams. Importantly, by varying the input pump beam polarization it is possible to direct the SFG emission to different diffraction orders, thereby opening up new opportunities for nonlinear light sources and infrared to visible light conversion.

Item Type:	Journal article
Publication Title:	Nano Letters
Creators:	Camacho-Morales, R., Xu, L., Zhang, H., Ha, S.T., Krivitsky, L., Kuznetsov, A.I., Rahmani, M. and Neshev, D.
Publisher:	American Chemical Society
Date:	22 July 2022
ISSN:	1530-6984
Identifiers:	Number Type 10.1021/acs.nanolett.2c01349 DOI 1578539 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	01 Aug 2022 11:09
Last Modified:	22 Jul 2023 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/46795

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