Mehdi Keshavarz M, Alighanbari Abbas
Appl Opt. 2019 May 1;58(13):3604-3612. doi: 10.1364/AO.58.003604.
A novel terahertz (THz) refractive index sensor based on Tamm plasmon-polaritons (TPPs), comprising a Bragg reflector and a graphene layer, is proposed. A semi-analytical transfer matrix method is used to study the proposed structure and its sensing performance. The sensor demonstrates a sensitivity of 0.744 THz per refractive index unit (THz/RIU), or equivalently, 175.5 μm/RIU, and a figure of merit of 10.33 RIU at the operating frequency of 1.132 THz. The effects of structural parameters on the sensing performance are studied, offering new methods for improving TPP-based sensors. The proposed approach is a simple and practical alternative to traditional, and often more complex, THz sensing approaches, due to the ease of excitation, which lifts the requirement of phase and polarization-matching devices such as polarizers, prisms, and gratings. The proposed structure is studied for gas sensing, and its performance is compared with previous THz refractive index sensing structures.
提出了一种基于塔姆表面等离激元极化子（TPP）的新型太赫兹（THz）折射率传感器，该传感器由布拉格反射器和石墨烯层组成。采用半解析传输矩阵法研究了所提出的结构及其传感性能。该传感器在1.132太赫兹的工作频率下，灵敏度为每折射率单位0.744太赫兹（THz/RIU），等效于175.5微米/RIU，品质因数为10.33 RIU。研究了结构参数对传感性能的影响，为改进基于TPP的传感器提供了新方法。由于易于激发，该方法无需使用诸如偏振器、棱镜和光栅等相位和偏振匹配器件，是传统且通常更为复杂的太赫兹传感方法的一种简单实用的替代方案。对所提出的结构进行了气体传感研究，并将其性能与先前的太赫兹折射率传感结构进行了比较。
