Polarization-insensitive dual-band response governed by quasi bound states in the continuum for high-performance refractive index sensing
Polarization-insensitive dual-band response governed by quasi bound states in the continuum for high-performance refractive index sensing
复制标题
由连续体中的准束缚态控制的偏振不敏感双频带响应，用于高性能折射率传感
DOI：
10.1016/j.rinp.2021.105125
复制
发表时间：
2022-01-01
影响因子：
5.3
通讯作者：
Meng, Dejia
中科院分区：
文献类型：
--
作者：
Liu, Wenjun;Liang, Zhongzhu;Meng, Dejia
将畸变引入到具有面内对称性的超颖表面中提供了实现具有高质量（Q）因子的谐振的可能性，但是这样的畸变使得超颖表面对入射光的偏振状态敏感。在这里，我们提出并数值演示了偏振不敏感的双波段折射率（RI）传感器。在这项工作中，拟议的超颖表面被赋予四重对称相结合的两对不对称的硅椭圆纳米盘，使其能够获得偏振不敏感的属性入射光。两个窄带反射峰的半高宽（FWHM）为3.36 nm和4.53 nm的激发和定制的RI传感。它们的灵敏度分别为2756.67 nm/RIU和2319.93 nm/RIU，品质因数（FOM）分别为820.44 RIU-1和532.09 RIU-1。该工作为实现偏振无关的高性能折射率传感器器件提供了一种新的途径。
The introduction of distortions into the metasurfaces with in-plane symmetry offers a possibility to achieve resonances with high quality (Q) factors, but such distortions make the metasurfaces sensitive to the polarization state of the incident light. Here, we propose and numerically demonstrate a polarization-insensitive dual-band refractive index (RI) sensor. In this work, the proposed metasurface is imparted with fourfold symmetry by combining two pairs of asymmetric silicon elliptical nanodisks, allowing it to acquire polarization-insensitive properties to the incident light. Two narrow-band reflection peaks with full width at half maximum (FWHM) of 3.36 nm and 4.53 nm are excited and tailored for RI sensing. Their sensitivities are 2756.67 nm/RIU and 2319.93 nm/RIU, with figure of merit (FOM) values of 820.44 RIU-1 and 532.09 RIU-1. This work provides a new approach to realize polarization-independent and high-performance RI sensor devices.