Dual-Band Chiral Nonlinear Metasurface Supported by Quasibound States in the Continuum

被引：16

作者：

Liu, Qing-Song ^{[1
,2
]}

Chao, Ming-Hao ^{[1
,2
]}

Zhang, Wen-Jing ^{[1
,2
]}

Song, Guo-Feng ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China

[2] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China

来源：

ANNALEN DER PHYSIK | 2022年 / 534卷 / 12期

基金：

中国国家自然科学基金;

关键词：

bound states in the continuum; chirality; nonlinear metasurface; 2ND-HARMONIC GENERATION;

D O I：

10.1002/andp.202200263

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

This paper presents an all-dielectric chiral metasurface composed of an array of two-layer distorted square structures with nanoholes. This metasurface can simultaneously generate dual-band opposite chiral responses, which can be attributed to the bound states in the continuum (BICs) and the distorted chiral structure. By combining the BICs with chirality, a dual-band chiral nonlinear metasurface and a chiral-sensing method are proposed. The simulated results show that the third harmonic generation (THG) conversion efficiency can reach the order of 10(-4) for two peaks with a peak-pump intensity of approximately 5.3 GW cm(-2) in the near-infrared region. Moreover, the third-harmonic circular dichroism for each peak can reach up to 0.99 and -0.94, respectively. Furthermore, it is theoretically demonstrated that this metasurface can be used for chiral sensing with high sensitivities. These results provide new insights for linear and nonlinear spin-dependent applications.

引用

页数：9