Double-layer Symmetric Gratings with Bound States in the Continuum for Dual-band High- Optical Sensing

Overview

Journal Beilstein J Nanotechnol

Specialty Biotechnology

Date 2022 Dec 9

PMID 36483638

Authors

Chaoying Shi

Jinhua Hu

Xiuhong Liu

Junfang Liang

Jijun Zhao

Haiyan Han

Qiaofen Zhu

Affiliations

Soon will be listed here.

Abstract

Herein, we theoretically demonstrate that a double-layer symmetric gratings (DLSG) resonator consisting of a low-refractive-index layer sandwiched between two high-contrast gratings (HCG) layers, can host dual-band high-quality () factor resonance. We find that the artificial bound states in the continuum (BIC) and Fabry-Pérot BIC (FP-BIC) can be induced by optimizing structural parameters of DLSG. Interestingly, the artificial BIC is governed by the spacing between the two rectangular dielectric gratings, while the FP-BIC is achieved by controlling the cavity length of the structure. Further, the two types of BIC can be converted into quasi-BIC (QBIC) by either changing the spacing between adjacent gratings or changing the distance between the upper and lower gratings. The simulation results show that the dual-band high-performance sensor is achieved with the highest sensitivity of 453 nm/RIU and a maximum figure of merit (FOM) of 9808. Such dual-band high- resonator is expected to have promising applications in multi-wavelength sensing and nonlinear optics.

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