A new asymmetric structure based on Tamm plasmon polaritons (TPPs) and a metal-distributed Bragg reflector (DBR) is proposed in this paper, which can be applied in high-sensitivity terahertz sensors. The structure includes monolayer graphene and two DBRs with different central frequencies on two sides of the graphene. One of its edge faces is introduced by silver film for enhancing the TPPs excitation. The result shows two Tamm plasmonic modes at frequencies of 1.0 THz and 1.1 THz can be excited by the structure. By increasing Fermi energy of graphene, or reducing the width of the top defect layer, the TPPs excitation can be enhanced, and the sensitivity of the structure can also be improved. Moreover, the sensitivity is more sensitive to the incidence angle of TM and TE polarizations from 0° to 25°. By optimizing the structural parameters, the sensitivity and figure of merit of two Tamm plasmonic modes can attain 1.17 THz/RIU, 1.2 THz/RIU, ${32.28}\;{{\rm RIU}^{- 1}}$, and ${30.95}\;{{\rm RIU}^{- 1}}$, respectively, which demonstrates that such a structure is a candidate for a dynamic tunable TPPs terahertz device for a high-sensitivity terahertz sensor.

中文翻译：

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基于石墨烯不对称结构的Tamm等离子体激元的高灵敏度太赫兹传感器

本文提出了一种基于 Tamm 等离子体激元 (TPP) 和金属分布布拉格反射器 (DBR) 的新型非对称结构，可应用于高灵敏度太赫兹传感器。该结构包括单层石墨烯和石墨烯两侧具有不同中心频率的两个DBR。其边缘面之一由银膜引入，以增强 TPPs 激发。结果表明，该结构可以激发频率为 1.0 THz 和 1.1 THz 的两种 Tamm 等离子体模式。通过增加石墨烯的费米能，或者减小顶部缺陷层的宽度，可以增强TPPs的激发，也可以提高结构的灵敏度。此外，灵敏度对 0° 到 25° 的 TM 和 TE 偏振的入射角更敏感。通过优化结构参数，${32.28}\;{{\rm RIU}^{- 1}}$和${30.95}\;{{\rm RIU}^{- 1}}$分别证明了这样的结构是用于高灵敏度太赫兹传感器的动态可调 TPPs 太赫兹器件的候选者。