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Optical Engineering

Reflectance-based low-cost disposable optical fiber surface plasmon resonance probe with enhanced biochemical sensitivity
Author(s): Papiya Dhara; Vinod Kumar Singh; Massimo Olivero; Guido Perrone
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Paper Abstract

A reflectance-based surface plasmon resonance (SPR) fiber sensor with enhanced sensitivity for biochemical sensing is reported after comparing its result with the transmittance-based SPR optical fiber sensors. The fabricated SPR sensor contains a gold-coated multimode fiber with the implementation of a standard source-sensor-spectrometer interrogation system. As the refractive index of the liquid under test is increased, a redshift of the SPR is observed. The coupling of the source to the fiber sensor is optimized by investigating the effect of an intentional misalignment in transmission-based setup. When a fiber tip coated with the silver mirror and the bifurcated fiber bundle is used, an alignment-free disposable sensor probe is achieved. A comprehensive characterization of the proposed reflectance-based SPR probe is discussed. The maximum sensitivity of 3212.19  nm/refractive index unit (RIU) is obtained.

Paper Details

Date Published: 26 April 2016
PDF: 7 pages
Opt. Eng. 55(4) 046114 doi: 10.1117/1.OE.55.4.046114
Published in: Optical Engineering Volume 55, Issue 4
Show Author Affiliations
Papiya Dhara, Indian School of Mines (India)
Politecnico di Torino (Italy)
Vinod Kumar Singh, Indian School of Mines (India)
Massimo Olivero, Politecnico di Torino (Italy)
Guido Perrone, Politecnico di Torino (Italy)

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