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Optical Fiber Sensors Based on Local Surface Plasmon Resonance Modified with Silver Nanoparticles

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4 Author(s)
Liu Shengping ; Chongqing Univ. of Technol., Chongqing, China ; Su Sen ; Chen Guanlan ; Zeng Xiangkai

Silver nanoparticles were prepared adopting microwave synthesizing method and coated on the optical fiber lateral utilizing a self-assembling technology. An optical fiber sensor based on localized surface plasmon resonant (LSPR) was developed. UV-vis extinction spectrum of the optical fiber modified nanoparticles was investigated with a fiber spectrometer. The results show that LSPR extinction peak locates at 426.57 nm in pure water. LSPR peak produces a red shift with the increase of the refractive index of sample solution. The peak wavelength bears a linear relationship to the refractive index of sucrose solution over a range of 6%-30% (mass percentage), with a sensitivity of 178 nm/RIU. Although silver nanoparticles aggregated fractionally, the optical sensor still can distinguish the difference of dielectric constant of the sample solution. But the sensitivity is lowered to 120 nm/RIU. And, there is a linear relationship between the extinction peak intensity of LSPR and the refractive index of the solution, with a sensitivity of 1.612 AU/RIU.

Published in:

Intelligent System Design and Engineering Application (ISDEA), 2012 Second International Conference on

Date of Conference:

6-7 Jan. 2012