Giant enhancement of second-harmonic generation from a nanocavity metasurface

Autor: Yan Jun Liu, Mingke Jin, Ningbin Mao, Yang Li, Junhong Deng, Yutao Tang, Xuecai Zhang, Yao Wang, Kingfai Li, Wenfeng Cai, Xuan Liu, Guixin Li
Rok vydání: 2021
Předmět:
Zdroj: Science China Physics, Mechanics & Astronomy. 64
ISSN: 1869-1927
1674-7348
DOI: 10.1007/s11433-021-1743-1
Popis: Nonlinear plasmonic metasurfaces are compatible with complementary metal oxide semiconductor technology and highly promising for on-chip optical switching and modulations and nanoscale frequency conversions. However, the low nonlinear-optical response of metasurface devices limits their practical applications. To circumvent this constraint, we propose the design of a nanocavity plasmonic metasurface, in which the strong light localization in the nanocavity can be used to boost the efficiency of second-harmonic generation. Compared with the single-layer counterpart, experimental results show that the intensity of the second-harmonic waves in the nanocavity metasurface is enhanced by ~790 times. The proposed nanocavity plasmonic metasurfaces in this work may open new routes for developing highly efficient nonlinear metacrystals for on-chip nonlinear sources, nonlinear image encryption, information processing, and so on.
Databáze: OpenAIRE
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