Third harmonic generation from the gold/amorphous silicon hybrid metasurface

Yang Li, Guanqing Zhang, Yutao Tang, Xuecai Zhang, Wenfeng Cai, Yanjun Liu, Tun Cao*, Guixin Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The nonlinear optical properties of silicon have great potentials for developing all-optical switches and modulators, etc. Strategies based on all dielectric silicon photonic crystals and resonators have been proposed to design the nanophotonic devices with high nonlinearity. Nevertheless, the lack of compatible configuration with the mature CMOS technology may hinder the practical applications of the all dielectric devices. In this work, we proposed a metal-silicon hybrid metasurface to generate strong third harmonic signals from an amorphous silicon (α-Si) film. By integrating the α-Si film into a gold plasmonic nanocavity and controlling the periods of the gold meta-atoms, the efficiency of the THG process is expected to be greatly boosted. Compared to the planar α-Si film, the THG signal is enhanced by a factor of ∼370. The presented results in this work may open new routes for developing various silicon photonic devices with high optical nonlinearity.

Original languageEnglish
Pages (from-to)2245-2251
Number of pages7
JournalNanophotonics
Volume11
Issue number10
Early online date20 Apr 2022
DOIs
Publication statusPublished - May 2022

Scopus Subject Areas

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

User-Defined Keywords

  • metasurface
  • plasmonics
  • third harmonic generation

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