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Sensors 2015, 15(7), 17106-17114; doi:10.3390/s150717106

An Exposed-Core Grapefruit Fibers Based Surface Plasmon Resonance Sensor

College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 12 June 2015 / Revised: 6 July 2015 / Accepted: 6 July 2015 / Published: 14 July 2015
(This article belongs to the Section Physical Sensors)
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Abstract

To solve the problem of air hole coating and analyte filling in microstructured optical fiber-based surface plasmon resonance (SPR) sensors, we designed an exposed-core grapefruit fiber (EC-GFs)-based SPR sensor. The exposed section of the EC-GF is coated with a SPR, supporting thin silver film, which can sense the analyte in the external environment. The asymmetrically coated fiber can support two separate resonance peaks (x- and y-polarized peaks) with orthogonal polarizations and x-polarized peak, providing a much higher peak loss than y-polarized, also the x-polarized peak has higher wavelength and amplitude sensitivities. A large analyte refractive index (RI) range from 1.33 to 1.42 is calculated to investigate the sensing performance of the sensor, and an extremely high wavelength sensitivity of 13,500 nm/refractive index unit (RIU) is obtained. The silver layer thickness, which may affect the sensing performance, is also discussed. This work can provide a reference for developing a high sensitivity, real-time, fast-response, and distributed SPR RI sensor. View Full-Text
Keywords: exposed-core grapefruit fibers; surface plasmon resonance; x- and y-polarized; silver layer thickness exposed-core grapefruit fibers; surface plasmon resonance; x- and y-polarized; silver layer thickness
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yang, X.; Lu, Y.; Wang, M.; Yao, J. An Exposed-Core Grapefruit Fibers Based Surface Plasmon Resonance Sensor. Sensors 2015, 15, 17106-17114.

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