Huang, Yi, Zhong, Shuncong, Shi, Tingting, Shen, Yao-Chun 
ORCID: 0000-0002-8915-1993 and Cui, Daxiang
(2019)
HR-Si prism coupled tightly confined spoof surface plasmon polaritons mode for terahertz sensing.
Optics Express, 27 (23).
p. 34067.
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Abstract
We report a high-resistivity silicon (HR-Si) prism coupled terahertz (THz) spoof surface plasmon polaritons (SSPPs) on flat subwavelength metasurface. Using a high refractive index prism as an external coupler, a more tightly confined SSPPs mode can be excited in a smaller resonant cavity, leading to strong light-matter interaction. Besides, theoretical analysis and experimental results have both indicated that the SSPPs resonance response to the filling patterns of analyte in the resonant cavity are quite different. In particular, we have found that the interaction between analyte and SSPPs wave can be maximized when the analyte filled with the whole resonant cavity and a higher sensitivity for THz sensing can be obtained. A high sensitivity varied from 0.31 THz/RIU to 0.85 THz/RIU is predicted. Furthermore, these SSPPs modes exhibit high Q-factor, and characteristic spectra of water caused by surface plasmon resonance (SPR) are observed, which is significant in promoting the THz-SPR sensing of polar liquids or aqueous analytes with THz metasurfaces.
| Item Type: | Article |
|---|---|
| Depositing User: | Symplectic Admin |
| Date Deposited: | 18 Nov 2019 09:35 |
| Last Modified: | 19 Jan 2023 00:20 |
| DOI: | 10.1364/oe.27.034067 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3062014 |
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