Black phosphorus/waveguide terahertz plasmonic structure for ultrasensitive tunable gas sensing
| Autor: | Xia Cao, Jian-Bo Li, Deng-Yun Lu, Hao-Jie Luo, Jian-Qiang Liu, Kai-Jun Wang, Xin-Min Zhang, Wei Li, Hu Zhou, He Mengdong, Liang Xu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Waveguide (electromagnetism)
Materials science business.industry Terahertz radiation Polymethylpentene Physics::Optics Fano resonance Resonance Condensed Matter Physics Surface plasmon polariton Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Hardware and Architecture Optoelectronics Electrical and Electronic Engineering Surface plasmon resonance business Plasmon |
| Zdroj: | Photonics and Nanostructures - Fundamentals and Applications. 46:100946 |
| ISSN: | 1569-4410 |
| DOI: | 10.1016/j.photonics.2021.100946 |
| Popis: | In this study, we propose a black phosphorus (BP)/waveguide terahertz plasmonic sensing structure comprising vertically stacked crystal quartz, polymethylpentene (TPX), BP, crystal quartz, and TPX layers on a germanium prism. Sharp Fano-type resonance is induced by strong coupling between the surface plasmon polariton and planar waveguide modes, and it generates imaging sensitivity of up to 9.978 × 103 RIU−1 for gas detection, with better sensing performance than other terahertz plasmonic gas sensors. Due to the in-plane anisotropic plasmonic property of BP, the proposed sensing structure exhibits optically tunable detection sensitivity and the imaging sensitivity is highly dependent on the direction. In addition, we investigated the changes in the Fano resonance and surface plasmon resonance, as well as the figure of merit for the imaging sensitivity according to structural parameters such as the thicknesses of the crystal quartz and TPX layers. Our results suggest that the proposed structure may have potential applications in gas detection in the terahertz band. |
| Databáze: | OpenAIRE |
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