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Optimal Design for U-bent Fiber-optic LSPR Sensor Probes

DSpace at IIT Bombay

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Field Value
 
Title Optimal Design for U-bent Fiber-optic LSPR Sensor Probes
 
Creator SATIJA, J
PUNJABI, NS
SAI, VVR
MUKHERJI, S
 
Subject Localized surface plasmon resonance
Fiber-optic sensor
Gold nanoparticle
Evanescent wave absorbance
Refraction loss
Refractive index
SURFACE-PLASMON RESONANCE
FIELD ABSORPTION SENSOR
OPTICAL-FIBER
GOLD NANOPARTICLES
ABSORBENCY SENSOR
BLOOD-GLUCOSE
BIOSENSOR
SENSITIVITY
LAYERS
GLASS
 
Description The refractive index (RI) sensitivity of a localized surface plasmon resonance (LSPR)-based fiber-optic probes is dependent on surface coverage of gold nanoparticles (GNP), fiber core diameter, and probe geometry. For U-bent LSPR fiber-optic probes, which demonstrated an order higher absorption sensitivity over straight probes, bend diameter and probe length may also have a significant influence on the sensitivity. This study on U-bent fiber-optic LSPR probes is aimed at optimizing these parameters to obtain highest possible RI sensitivity. RI sensitivity increases linearly as a function of surface coverage of GNP in the range of 2-22 %. U-bent fiber-optic probes made of 200-, 400-, and 600-mu m fiber core diameter show optimum bend diameter value as -1.4 mm. In addition, RI sensitivity is almost the same irrespective of fiber core diameter demonstrating flexibility in choice of the fiber and ease in optical coupling. The length of the probe preceding and succeeding the bend region has significantly less influence on RI sensitivity allowing miniaturization of these probes. In addition to these experimental studies, we present a theoretical analysis to understand the relative contribution of evanescent wave absorbance of GNP and refractive losses in the fiber due to GNP, towards the RI sensitivity.
 
Publisher SPRINGER
 
Date 2014-12-28T14:11:47Z
2014-12-28T14:11:47Z
2014
 
Type Article
 
Identifier PLASMONICS, 9(2)251-260
1557-1955
1557-1963
http://dx.doi.org/10.1007/s11468-013-9618-7
http://dspace.library.iitb.ac.in/jspui/handle/100/16720
 
Language English