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Investigation of the effect of curvature on sensitivity of bio/chemical sensors based on embedded polymer semicircular waveguides

DSpace at IIT Bombay

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Title Investigation of the effect of curvature on sensitivity of bio/chemical sensors based on embedded polymer semicircular waveguides
 
Creator PRABHAKAR, A
MUKHERJI, S
 
Subject Embedded C-shaped waveguide
Microchannel
Bend radius
Evanescent wave
Optical waveguide biosensor
SU-8 waveguide
FIELD ABSORPTION SENSOR
FIBER
PROBE
GEOMETRY
 
Description U-bend optical fiber probes have been shown to be very responsive to refractive index variations around the core, which makes them ideally suited for biosensor applications. Similar U-shaped polymer waveguides have also been fabricated using standard micro-fabrication technology. In the present study, suitable bend radii for such U-shaped embedded polymer waveguide probes have been determined for bio/chemical sensing applications. Although the effect of bend radii have been studied earlier for U-bend optical fiber sensors, such an investigation has not yet been performed for embedded bent waveguides. A single step fabrication procedure was performed to pattern SU-8 photo resist into semicircular C-shaped waveguides (of various bending diameters) interfacing a microchannel network and ending in fiber-to-waveguide coupler structures. The refractive index (RI) sensitivity was found to double as the bending radius was reduced from 2 to 1 mm, however the interaction length did not have any effect on RI sensitivity. The evanescent absorbance per unit length was also found to double, when the bend radius was reduced from 2 to 1 mm. Finally, the efficacy of these 1 mm bending diameter embedded waveguides as evanescent wave absorbance based immuno-biosensors was studied by immobilizing HIgG molecules on the waveguides and allowing FITC tagged GaHIgG molecules to interact with them. (C) 2012 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-10-15T12:59:24Z
2014-10-15T12:59:24Z
2012
 
Type Article
 
Identifier SENSORS AND ACTUATORS B-CHEMICAL, 1711303-1311
http://dx.doi.org/10.1016/j.snb.2012.05.013
http://dspace.library.iitb.ac.in/jspui/handle/100/14948
 
Language en