Theoretical and Experimental Investigation of an All-Fiber Waveguide Coupled Surface Plasmon Resonance Sensor With Au-ZnO-Au Sandwich Structure

In this paper, we proposed an all-fiber waveguide coupled surface Plasmon resonance (SPR) sensor which was designed and fabricated with Au-ZnO-Au sandwich multi-layer structure. Based on the transfer matrix method (TMM), the theoretical modeling of the proposed sensor structure was investigated. The...

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.169961-169968
Main Authors: Ma, Jinying, Liu, Kun, Jiang, Junfeng, Xu, Tianhua, Wang, Shuang, Chang, Pengxiang, Zhang, Zhao, Zhang, Jiahang, Liu, Tiegen
Format: Article
Language:English
Subjects:
Gold
Multilayers
optical fiber
Optical fiber sensors
Optical fibers
Refractive index
refractive index sensing
Refractivity
Sandwich structures
sensitivity
Sensitivity enhancement
Sensors
Surface plasmon resonance
Thickness
Transfer matrices
waveguide coupled
Waveguides
Zinc oxide
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Summary:In this paper, we proposed an all-fiber waveguide coupled surface Plasmon resonance (SPR) sensor which was designed and fabricated with Au-ZnO-Au sandwich multi-layer structure. Based on the transfer matrix method (TMM), the theoretical modeling of the proposed sensor structure was investigated. The influence of the layer thickness on the transmission spectrum of the sensor was studied numerically, in order to optimize each layer thickness, leading to sensitivity enhancement in the infrared spectral range. Meanwhile, an experimental testbed for the refractive index measurement was implemented based on the proposed all-fiber waveguide coupled SPR sensor. Using this waveguide coupled SPR sensor, the refractive index sensing was realized with a sensitivity enhancement of 7%-131% compared with conventional SPR sensors.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2955471