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Optical Sensors

Application of spectral surface plasmon resonance to gas pressure sensing

[+] Author Affiliations
Chi-lok Wong

City University of Hong Kong, Department of Physics and Materials Science, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China

HoPui Ho

Chinese University of Hong Kong, Department of Electronic Engineering, NT, Hong Kong SAR, China

Kwok-sum Chan

City University of Hong Kong, Department of Physics and Materials Science, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China

Shu-yuen Wu

Chinese University of Hong Kong, Department of Electronic Engineering, NT, Hong Kong SAR, China

Chinlon Lin

Chinese University of Hong Kong, Centre for Advanced Research in Photonics, NT, Hong Kong SAR, China

Opt. Eng. 44(12), 124403 (September 24, 2004April 03, 2005May 18, 2005December 30, 2005). doi:10.1117/1.2148913
History: Received September 24, 2004; Revised April 03, 2005; Accepted May 18, 2005; Published December 30, 2005
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An optical sensor to be used for gas pressure detection is described. The device is based on the spectral response associated with the surface plasmon resonance (SPR) occurring on a 50-nm gold surface. The operation of the device relies on the fact that the refractive index of a gas changes with pressure, which leads to a shift in the resonance wavelength dip λSPR in the SPR curve. Experiments performed on nitrogen gas at room temperature demonstrated the sensor resolution of 4.4×105 RUI, which corresponds to a pressure resolution of 16kPa. The new device offers the benefits of wide dynamic range, no moving parts, and possibly 2-D imaging of pressure distribution. Further development of the device may lead to a new type of optical pressure sensors.

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© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Chi-lok Wong ; HoPui Ho ; Kwok-sum Chan ; Shu-yuen Wu and Chinlon Lin
"Application of spectral surface plasmon resonance to gas pressure sensing", Opt. Eng. 44(12), 124403 (September 24, 2004April 03, 2005May 18, 2005December 30, 2005). ; http://dx.doi.org/10.1117/1.2148913


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