Journal
OPTICS EXPRESS
Volume 22, Issue 21, Pages 25149-25160Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.025149
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Funding
- National Natural Science Foundation of China [51005077]
- Fujian Provincial Excellent Young Scientist Fund
- Training Program of Fujian Excellent Talents in Universities
- Specialised Research Fund for the Doctoral Program of Higher Education
- Ministry of Education, P.R. China [20133514110008]
- Ministry of Health, P.R. China [WKJ-FJ-27]
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We report terahertz surface plasmon resonance (SPR) sensing based on prism-coupling to the spoof surface plasmon polariton (SSPP) mode existing on periodically grooved metal films. It was demonstrated that, except for the fundamental mode of the SSPP, there was also a higher mode SSPP wave when the depth of groove was larger. Both fundamental and high-order modes of SSPP could be used for terahertz sensing. We compared the performance of different modes of SSPP on the sensing sensitivity using both reflection amplitude and phase-jump information. The results indicated that the gap distance between the prism base and the metal film had a significant influence on the reflectivity of SPR sensing by affecting the coupling efficiency of an evanescent wave to an SSPP wave; also, high-order mode SSPP-based sensing had a high sensitivity of up to 2.27 THz/RIU, which nearly doubled the sensitivity of the fundamental mode. The application of high-mode SSPP has enormous potential for ultra-sensitive SPR sensing in the terahertz regime. (C) 2014 Optical Society of America
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