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01-07-2010 | Technical Paper | Issue 7/2010

Microsystem Technologies 7/2010

Novel U-shape gold nanoparticles-modified optical fiber for localized plasmon resonance chemical sensing

Journal:
Microsystem Technologies > Issue 7/2010
Authors:
Chien-Hsing Chen, Tzu-Chien Tsao, Wan-Yun Li, Wei-Chih Shen, Chung-Wei Cheng, Jaw-Luen Tang, Chun-Ping Jen, Lai-Kwan Chau, Wei-Te Wu

Abstract

A novel fiber-optic localized plasma resonance (FO-LPR) sensor composed of a U-shape optical fiber was proposed and demonstrated in this study. The U-shape optical fiber was fabricated by a femtosecond laser micromachining system. The dimensions of the U-shape zone were 100 μm in depth measured from the surface of the polymer jacket layer, 80 μm in width in the jacket layer, 60 μm in width in the cladding layer. The total length is 5 mm. After laser annealing treatment, the average surface roughness was 205.8 nm as determined by Atom Force Microscope (AFM). The exposed surface of the U-shape fiber was modified with self-assembled gold nanoparticles to produce the FO-LPR sensor. The response of the sensor shows that the signal increases linearly with increasing refractive index. The sensor resolution of the sensor was determined to be 1.06 × 10−3 RIU.

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