Abstract

We present electromagnetic design and analysis of hybrid metasurfaces composed of multilayer gallium selenide (GaSe) coupled to silicon holey disk arrays for achieving high spectral contrast chiral second-harmonic generation (SHG). The silicon holey disk structures are designed to support electromagnetically induced transparency (EIT)-like optical resonances in the 1.5–1.8 µm wavelength range in the vicinity of electric and toroidal dipole scattering modes. The fundamental electric field enhancement above the silicon structures shows right-circularly polarized (RCP)- and left-circularly polarized (LCP)-like characteristics at distinct wavelengths resulting in two prominent peaks for the LCP and RCP resolved SHG from the GaSe layer above the holey disks. This results in high contrast SHG degree of circular polarization spanning ${-}{{1}}$ to ${+}{{1}}$ over the fundamental excitation spectral range considered. The chiral SHG response is also found to be strongly influenced by the unit-cell lattice arrangement with square or hexagonal lattice exhibiting very different chiral SHG response. This observation is consistent with the circular polarization state selection rules for the harmonic generation process considering the rotational symmetry of the underlying metasurface lattice arrangement. Two-dimensional (2D) material–dielectric resonant metasurface hybrid systems exhibit nonlinear optical polarization selection rules, which differ from the native 2D material, making them an interesting platform for realizing engineered chiral nonlinear photonic devices.

© 2022 Optica Publishing Group

Polarization independent enhancement of zeroth order diffracted second harmonic from multilayer gallium selenide on a silicon resonant metasurface

Jayanta Deka, Medha Dandu, Lal Krishna A. S., Sruti Menon, K. M. Jyothsna, Rabindra Biswas, Kausik Majumdar, and Varun Raghunathan
Opt. Express 28(24) 35695-35707 (2020)

Dual-function polarization converter of an all-dielectric metasurface with a chiral L-type meta-atom

Yixing Song, Jianing Zhai, Shuang Huo, Yong Zeng, and Xiaohong Sun
J. Opt. Soc. Am. B 39(12) 3255-3262 (2022)

Multiple resonant modes coupling enabled strong CD response in a chiral metasurface

Shu Zong, Dongwen Zeng, Guiqiang Liu, Yan Wang, Zhengqi Liu, and Jing Chen
Opt. Express 30(22) 40470-40481 (2022)

Wavelength-tunable infrared chiral metasurfaces with phase-change materials

Haotian Tang, Liliana Stan, David A. Czaplewski, Xiaodong Yang, and Jie Gao
Opt. Express 31(13) 21118-21127 (2023)

Ultra-narrow-band circular dichroism by surface lattice resonances in an asymmetric dimer-on-mirror metasurface

Jigang Hu, Yuxi Xiao, Lei-Ming Zhou, Xiaoyun Jiang, Wei Qiu, Wu Fei, Yang Chen, and Qiwen Zhan
Opt. Express 30(10) 16020-16030 (2022)