High-mode spoof SPP of periodic metal grooves for ultra-sensitive terahertz sensing

Haizi Yao, Shuncong Zhong

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

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.
LanguageEnglish
Pages25149-25160
Number of pages12
JournalOptics Express
Volume22
Issue number21
Early online date7 Oct 2014
DOIs
Publication statusPublished - 20 Oct 2014

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grooves
polaritons
metals
surface plasmon resonance
metal films
prisms
sensitivity
evanescent waves
reflectance

Keywords

  • terahertz surface plasmon resonance
  • prism coupling
  • spoof surface plasmon polariton
  • terahertz sensing

Cite this

Yao, Haizi ; Zhong, Shuncong. / High-mode spoof SPP of periodic metal grooves for ultra-sensitive terahertz sensing. In: Optics Express. 2014 ; Vol. 22, No. 21. pp. 25149-25160.
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abstract = "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.",
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High-mode spoof SPP of periodic metal grooves for ultra-sensitive terahertz sensing. / Yao, Haizi; Zhong, Shuncong.

In: Optics Express, Vol. 22, No. 21, 20.10.2014, p. 25149-25160.

Research output: Contribution to journalArticle

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AU - Zhong, Shuncong

N1 - © 2014 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

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Y1 - 2014/10/20

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