Surface plasmon resonance prism coupler for gas sensing based on Stokes polarimetry

Quoc Hung Phan, Pei Ming Yang, Yu Lung Lo

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)

摘要

A surface plasmon resonance prism coupler comprising a half-ball lens, an isotropic Cr-Au layer and a Ta2O5 anisotropic layer is proposed for gas sensing applications. In the proposed approach, the coupler is illuminated with polarized light and a Stokes polarimetry approach is used to measure the change in six effective ellipsometric parameters as the coupler is exposed to gas samples with different refractive indices. The theoretical analysis is performed to investigate the sensitivity of the effective ellipsometric parameters to the refractive index of the detected gases. The validity of the proposed method is confirmed by comparing the experimental results for the sensitivity of the effective ellipsometric parameters with the analytical results. The results show that the coupler has a sensitivity of 7.5 × 104 deg/RIU (refractive index units) and a sensing resolution of 2 × 10-7 RIU in the indices dynamic range of 1.0-1.001. In general, the results presented in this study confirm that the proposed surface plasmon resonance coupler provides a simple and reliable solution for gas sensing using a Stokes polarimetry approach.

原文English
頁(從 - 到)247-254
頁數8
期刊Sensors and Actuators, B: Chemical
216
DOIs
出版狀態Published - 2015 九月 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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