人工晶体学报, 2023, 52 (11): 2068, 网络出版: 2023-12-05  

高Q值太赫兹传感器的设计与性能仿真分析

Design and Performance Simulation Analysis of High-Q Terahertz Sensors
作者单位
1 首都师范大学物理系, 北京 100048
2 太赫兹光电子学教育部重点实验室, 北京 100048
摘要
本文设计了一种非对称金属十字单元结构, 该结构由沉积于石英基底上的两个相互垂直共面金条构成。传统的金属十字结构中常用的LC谐振和偶极子谐振的辐射损耗较大, 限制了超表面传感器实现高品质因子和高透射率, 故通过打破传统金属十字结构的对称性, 引入类Fano共振效应, 从而使得透射峰灵敏度达到了218 GHz/RIU, 传感器的品质因子达到了78.3。通过分析该超表面的电场和表面电流分布, 探究了Fano共振效应的物理机制, 并进一步研究太赫兹传感器的结构参数对透过谱的影响, 通过调整结构参数优化该传感器的传感性能。最后, 设计了具有不同共振频率的非对称金属十字太赫兹传感器以便后续用于不同种类的微量氨基酸溶液的检测。
Abstract
This paper presents a design of an asymmetric metal cross unit structure, which consists of two perpendicular coplanar gold bars deposited on a quartz substrate. The conventional metal cross structure commonly suffers from significant radiation losses in LC resonance and dipole resonance, limiting the achievement of high quality factor and high transmittance in metasurface sensors. By breaking the symmetry of the traditional metal cross structure and introducing a Fano-like resonance effect, the transmission peak sensitivity of 218 GHz/RIU and the quality factor of 78.3 are achieved. The physical mechanism of the Fano resonance effect is explored by analyzing the electric field and surface current distribution of the metasurface. Furthermore, the influence of structural parameters on the transmission spectrum of the terahertz sensor is investigated, and the sensing performance of the sensor is optimized by adjusting the structural parameters. Finally, asymmetric metal cross terahertz sensors with different resonance frequencies are designed for the detection of various types of trace amino acid solutions in subsequent applications.

周鑫莉, 舒敬懿, 赵昊辰, 赵国忠. 高Q值太赫兹传感器的设计与性能仿真分析[J]. 人工晶体学报, 2023, 52(11): 2068. ZHOU Xinli, SHU Jingyi, ZHAO Haochen, ZHAO Guozhong. Design and Performance Simulation Analysis of High-Q Terahertz Sensors[J]. Journal of Synthetic Crystals, 2023, 52(11): 2068.

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