TY - JOUR
T1 - Surface plasmon resonance prism coupler for gas sensing based on Stokes polarimetry
AU - Phan, Quoc Hung
AU - Yang, Pei Ming
AU - Lo, Yu Lung
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided to this study by the National Science Council of Taiwan under Grant No. 102-2221-E-006-043-MY2 . Mr. Quoc-Hung Phan also wishes to thank National Cheng Kung University for the opportunity to participate in the PhD scholarship program.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.snb.2015.04.050
DO - 10.1016/j.snb.2015.04.050
M3 - Article
AN - SCOPUS:84928949734
SN - 0925-4005
VL - 216
SP - 247
EP - 254
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
ER -