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All-Dielectric Terahertz Metasurface with Giant Extrinsic Chirality for Dual-Mode Sensing
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2022-07-05 , DOI: 10.1002/pssb.202200114 Junyong Hou 1 , Jin Peng 1 , Tingting Tang 2 , Jie Li 2 , Zhenyi Chen 1
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2022-07-05 , DOI: 10.1002/pssb.202200114 Junyong Hou 1 , Jin Peng 1 , Tingting Tang 2 , Jie Li 2 , Zhenyi Chen 1
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Metasurface-based sensors, with their planar compact structure and excellent sensing performance, have become one of the emerging technologies in metasurface and nanophotonics in recent years. In particular, chiral metasurfaces show unique advantages for chiral molecule detection and enantiomer identification. Herein, a scheme of dual-mode sensing based on all-dielectric terahertz metasurface via chiral and achiral spectroscopy is proposed. The proposed achiral meta-atoms show great extrinsic chirality. The transmitted linearly polarized spectrum and the circular dichroism (CD) can be used as the sensing indicator under normal and oblique incidence of the terahertz waves, respectively. Among them, the working mode based on linear polarization spectrum only needs to measure the transmission spectrum once, which means wide applicability. The other mode using CD can eliminate the achiral terahertz absorption of the analyte through multiple measurements and has a higher signal-to-noise ratio. The results show that the maximum refractive index–frequency change rates of the two operating modes are −128.5 GHz/RIU and −124.7 GHz/RIU, respectively. In addition, there are two resonant peaks available in both working states, for both high-precision and wide-range refractive index detection. This new scheme is expected to be applied in industrial fields such as terahertz biochemical detection.
中文翻译：
用于双模传感的具有巨大外在手性的全介电太赫兹超表面
超表面传感器以其平面紧凑的结构和优异的传感性能，成为近年来超表面和纳米光子学的新兴技术之一。特别是，手性超表面在手性分子检测和对映体鉴定方面显示出独特的优势。在此，提出了一种基于手性和非手性光谱的全介电太赫兹超表面的双模传感方案。提出的非手性元-原子表现出很大的外在手性。透射的线偏振光谱和圆二色性（CD）可分别作为太赫兹波垂直入射和斜入射下的传感指标。其中，基于线性偏振光谱的工作模式只需对透射光谱进行一次测量，适用性广。使用CD的另一种模式可以通过多次测量消除分析物的非手性太赫兹吸收，并且具有更高的信噪比。结果表明，两种工作模式的最大折射率-频率变化率分别为-128.5 GHz/RIU和-124.7 GHz/RIU。此外，在两种工作状态下都有两个共振峰，用于高精度和宽范围的折射率检测。
更新日期：2022-07-05
中文翻译：
用于双模传感的具有巨大外在手性的全介电太赫兹超表面
超表面传感器以其平面紧凑的结构和优异的传感性能，成为近年来超表面和纳米光子学的新兴技术之一。特别是，手性超表面在手性分子检测和对映体鉴定方面显示出独特的优势。在此，提出了一种基于手性和非手性光谱的全介电太赫兹超表面的双模传感方案。提出的非手性元-原子表现出很大的外在手性。透射的线偏振光谱和圆二色性（CD）可分别作为太赫兹波垂直入射和斜入射下的传感指标。其中，基于线性偏振光谱的工作模式只需对透射光谱进行一次测量，适用性广。使用CD的另一种模式可以通过多次测量消除分析物的非手性太赫兹吸收，并且具有更高的信噪比。结果表明，两种工作模式的最大折射率-频率变化率分别为-128.5 GHz/RIU和-124.7 GHz/RIU。此外，在两种工作状态下都有两个共振峰，用于高精度和宽范围的折射率检测。
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