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Vol. 139, No. 4, April 2012, pp. 95-108

 

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Surface Plasmon Resonance Based Fiber Optic Sensor Utilizing Metal Nanoparticles: Influence of Ambient Temperature

 

1 Sachin K. SRIVASTAVA, 2 Vikas ARORA, 2 Sameer SAPRA, and *, 1 Banshi D. GUPTA

1 Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India

2 Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India

* Tel.: +91-11-26591355, fax: +91-11-26581114

 

Received: 9 February 2012   /Accepted: 23 April 2012   /Published: 30 April 2012

 

Digital Sensors and Sensor Sysstems

 

Abstract: Influence of ambient temperature on the performance of a localized surface plasmon resonance (LSPR) based fiber optic sensor has been studied, both experimentally and theoretically. The variation of resonance wavelength with change in refractive index confirms the working of the sensor. Water was considered as the sensing medium to study the effect of temperature. A negligible variation in resonance wavelength has been observed for the temperature change in the range 7 100 oC. However, a noticeable change in evanescent absorbance has been observed. The experimental results have been found to be in good agreement with that of theoretical model based on the absorption of evanescent field by the nanoparticles on the core of the fiber. The study implies that the fiber optic LSPR sensor is nearly insensitive to small temperature fluctuations while working in spectral interrogation scheme; however, intensity modulation scheme requires a correction factor for working at different ambient temperatures.

 

Keywords: Optical fiber, Surface plasmon, Metal nanoparticle, Sensor, Temperature

 

 

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