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Proceedings Paper

Evanescent-field sensor using selectively excited modes in step-index fibers
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Paper Abstract

High-order skew modes will be excited in multimode step-index fibers using special excitation conditions. As a result, light with an angle of incidence larger than the maximum angle for meridional modes given by the numerical aperture of the fiber can be coupled into a fiber. Combining the selective mode-excitation with new powerful broadband light-sources, the spectral light-guidance of such skew modes in different optical fibers will be described in detail. Results of the proposed system in context of different light-sources will be discussed. A new evanescent sensor approach based on controlled coupling of skew modes will be introduced. Finally, first steps to construct such sensors for medical and analytical applications will be presented.

Paper Details

Date Published: 16 February 2011
PDF: 11 pages
Proc. SPIE 7894, Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI, 789410 (16 February 2011); doi: 10.1117/12.879284
Show Author Affiliations
Karl-Friedrich Klein, Fachhochschule Giessen-Friedberg (Germany)
TransMIT GmbH (Germany)
Cornell Gonschior, Fachhochschule Giessen-Friedberg (Germany)
TransMIT GmbH (Germany)
Pasma Dahal, Fachhochschule Giessen-Friedberg (Germany)
Hanns S. Eckhardt, tec 5 AG (Germany)
Mathias Belz, World Precision Instruments, Inc. (United States)
Georg Hillrichs, Univ. of Applied Sciences Merseburg (Germany)

Published in SPIE Proceedings Vol. 7894:
Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI
Israel Gannot, Editor(s)

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