Refractometer based on resonance investigation of capillary cladding modes

A simple refractometer is demonstrated using a fused silica capillary spliced between two single-mode fibers. From a fundamental mode of a lead-in single-mode fiber, a number of cladding modes in the short piece of the capillary are excited. In the transmission spectrum, it could be as a formation o...

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Bibliographic Details
Published in:Journal of modern optics 2014-11, Vol.61 (19), p.1621-1624
Main Authors: Tatar, Peter, Kacik, Daniel, Schuster, Kay
Format: Article
Language:English
Subjects:
Biosensors
capillary
cladding modes
Experiments
Fibers
modes resonance
Optics
refractive index
Sensitivity
Silica
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Summary:A simple refractometer is demonstrated using a fused silica capillary spliced between two single-mode fibers. From a fundamental mode of a lead-in single-mode fiber, a number of cladding modes in the short piece of the capillary are excited. In the transmission spectrum, it could be as a formation of the resonance peaks observed. The experimental results of three different capillary diameter values are described. We presented the sensitivity comparison of all three cases for the liquid analyte refractive index (n a ) variations in the range from n a  = 1.33 to n a  = 1.43. The sensitivity improvement in the range from n a  = 1.3 to n a  = 1.35-195.4 nm/RIU is also presented. The proposed refractometer can be further developed as a simple and inexpensive solution for biosensor applications.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2014.946566