| 光谱学与光谱分析 |
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| The Experiment Research on Solution Refractive Index Sensor Based on Tilted Fiber Bragg Grating |
| JIANG Qi1, Lü Dan-dan1*, YU Ming-hao1, KANG Li-min2, OUYANG Jun2* |
1. School of Control Science and Engineering, Shandong University, Ji’nan 250061, China
2. School of Materials Science and Engineering, Shangdong University, Ji’nan 250061，China |
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Abstract The present paper analyzes the sensor’s basic principle of the bare tilted fiber Bragg grating (TFBG) and surface plasmon resonance sensor (SPR) that deposited nanoscale gold-coating on the surface of the cladding. We simulated the transmission spectrums and some order cladding mode of TFBG in different concentration solutions by Integration and optical fiber grating software OptiGrating. So by the graphic observation and data analysis, a preliminary conclusion was got that in a certain sensing scope, the cladding modes of TFBG shift slightly to right with the increasing the solution refractive index(SRI)，and the relation between resonance peak caused by the coupling of core mode and a certain cladding mode and the SRI was linear. Then the 45 nm thick gold coating was deposited on the surface of the TFBG cladding in a small-scale sputtering chamber KYKY SBC-12, and thermal field scanning electron microscopy presents that the effect of gold-coating was satisfactory to a certain extent in terms of microscopic level . The refractive index(RI) sensing experiments of different concentration solutions of NaCl，MgCl2，CaCl2 were carried out using bare and gold deposited TFBG. The RI sensing characteristics of both bare and gold deposited TFBGs respectively were studied by experiments. Meanwhile, it proved the conclusion that the cladding modes of TFBG drifted to right gradually when the SRI was increasing and the relations between resonance peak caused by the coupling of core mode and a certain cladding mode and the SRI were linear. And by quantitative analysis, we know that SPR sensor with the deposited namoscale gold layer on the surface of cladding enhanced the RI sensitivity dramatically by 2 to 500 nm·RIU-1 which is 200 to 300 times larger than that of the bare tilted fiber Bragg grating approximately. The degrees of linear fittings of resonance peak caused by the coupling of core mode and a certain cladding mode and SRI of bare and gold-coating deposited SPR sensor are very good and both of them reach up to more than 0.99.
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Received: 2013-03-14
Accepted: 2013-05-25
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Corresponding Authors:
Lü Dan-dan, OUYANG Jun
E-mail: lvdd0806@163.com;ouyangjun@sdu.edu.cn
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