Opened suspended core fiber chip based on surface plasma resonance enhancement mechanism

TAN Xuxiang; WANG Guanjun; WANG Zhibin

doi:10.7510/jgjs.issn.1001-3806.2016.02.012

For solving the problems of low surface intensity enhancement and slow response speed of fiber surface plasma resonance (SPR) sensors, a new type of optical fiber SPR-induced surface enhancement chip structure was proposed by using the mechanism of surface plasma resonance to improve the surface field enhancement degree. The characteristics of the proposed chip structure were analyzed based on the finite element method. When Au film layer thickness was near 40nm~50nm, a stronger field enhancement appeared. The degree of field enhancement was closely related with the transmitting wavelength. Reduction of cladding thickness, core diameter and refractive index contrast could increase the degree of field intensity enhancement, but radius and thickness of cladding had almost no effect on penetration depth. The results show that a good surface enhancement effort is feasible after optimization. The study could be beneficial for the application of fluid testing with high sensitivity and rapidity.

Opened suspended core fiber chip based on surface plasma resonance enhancement mechanism

Corresponding author: WANG Guanjun, wangguanjun@163.com;

1. Key Laboratory of Instrumental Science & Dynamic Measurement of Ministry of Education, North University of China, Taiyuan 030051, China;

2. Science and Technology on Electronic Test & Measurement Laboratory, North University of China, Taiyuan 030051, China

Received Date: 2015-01-14

Accepted Date: 2015-03-16

Available Online: 2016-03-25

Abstract: For solving the problems of low surface intensity enhancement and slow response speed of fiber surface plasma resonance (SPR) sensors, a new type of optical fiber SPR-induced surface enhancement chip structure was proposed by using the mechanism of surface plasma resonance to improve the surface field enhancement degree. The characteristics of the proposed chip structure were analyzed based on the finite element method. When Au film layer thickness was near 40nm~50nm, a stronger field enhancement appeared. The degree of field enhancement was closely related with the transmitting wavelength. Reduction of cladding thickness, core diameter and refractive index contrast could increase the degree of field intensity enhancement, but radius and thickness of cladding had almost no effect on penetration depth. The results show that a good surface enhancement effort is feasible after optimization. The study could be beneficial for the application of fluid testing with high sensitivity and rapidity.

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Reference (16)

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Opened suspended core fiber chip based on surface plasma resonance enhancement mechanism

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通讯作者: 陈斌, bchen63@163.com

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