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Proceedings Paper

Ray-tracing determination of evanescent-wave penetration depth in tapered fiber optic probes
Author(s): Joel P. Golden; Sina Y. Rabbany; George P. Anderson
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Paper Abstract

A fiber optic biosensor has been developed which monitors fluorescence to detect antibody/antigen binding within the evanescent wave. The sensing region is formed by removal of cladding from the core along the distal end of a step-index optical fiber and attaching the antibody. Reducing the radius by tapering the probe overcomes the mismatch in V-number which arises between the declad, immersed probe, and the clad fiber. Ray tracing analysis of tapered probes and of combination taper probes demonstrates that the evanescent wave penetration depth increases along the length of the taper, creating a probe with increased excitation light available at the surface for stimulating fluorescence.

Paper Details

Date Published: 30 April 1993
PDF: 5 pages
Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); doi: 10.1117/12.143504
Show Author Affiliations
Joel P. Golden, Naval Research Lab. (United States)
Sina Y. Rabbany, Hofstra Univ. (United States)
George P. Anderson, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 1796:
Chemical, Biochemical, and Environmental Fiber Sensors IV
Robert A. Lieberman, Editor(s)

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