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

Karl-Friedrich Klein; Cornell Gonschior; Pasma Dahal; Hanns S. Eckhardt; Mathias Belz; Georg Hillrichs

doi:10.1117/12.879284

16 February 2011 Evanescent-field sensor using selectively excited modes in step-index fibers

Karl-Friedrich Klein, Cornell Gonschior, Pasma Dahal, Hanns S. Eckhardt, Mathias Belz, Georg Hillrichs

Proceedings Volume 7894, Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI; 789410 (2011) https://doi.org/10.1117/12.879284
Event: SPIE BiOS, 2011, San Francisco, California, United States

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.

Citation Download Citation

Karl-Friedrich Klein, Cornell Gonschior, Pasma Dahal, Hanns S. Eckhardt, Mathias Belz, and Georg Hillrichs "Evanescent-field sensor using selectively excited modes in step-index fibers", Proc. SPIE 7894, Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI, 789410 (16 February 2011); https://doi.org/10.1117/12.879284

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