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Title

Collection efficiency of scattered light in single-ended optical fiber sensors

Author(s)

Jayawardhana, Sasani;  Mazzolini, Alexander P.;  Stoddart, Paul R.

Abstract

Optical fibers allow a variety of spectroscopic sensing methods to be implemented in a single-ended backscattering geometry. Taking multimode fibers with surface-enhanced Raman scattering active tips as a model system, it is shown that the remote single-ended collection geometry can be relatively inefficient in comparison to the performance of the underlying sensor structure. Therefore the performance of the single-ended geometry has been compared to the analogous sensor structure on a nonguiding silica glass substrate. While part of the reduction in collection efficiency can be attributed to mismatches between the numerical aperture of the collection optics and that of the fiber, this study suggests that there can be an additional loss due to a mismatch between the confocal area of the collection optics and the area of the fiber core. This effect is most significant for high numerical aperture objectives. However, the collection efficiency is somewhat higher than would be expected from a simple area ratio analysis. This can be attributed to the graded-index fiber used in the model system and the relaxation of confocal requirements in the longitudinal direction.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences

Source

Optics Letters, Vol. 37, no. 11 (Jun 2012), pp. 2142-2144

Publication year

2012

FOR Code(s)

0205 Optical Physics;  0206 Quantum Physics;  0906 Electrical and Electronic Engineering

Keyword(s)

Confocal raman microscopy;  Optical fibre sensors;  Scattering

Publisher

Optical Society of America

ISSN

0146-9592

Publisher URL

http://dx.doi.org/10.1364/OL.37.002142

Copyright

Copyright © 2012 Optical Society of America. This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OL.37.002142. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Research Projects

Opto-microfluidics: a rapid and sensitive platform for biological diagnostics, Australian Research Council grant number DP1092955
Development of a prototype production system for optical fibre diagnostic probes, National Health and Medical Research Council grant number 499321

Full text

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