Model of a thin-film optical fiber fluorosensor

Claudio Oliveira Egalon; Robert S. Rogowski

doi:10.1117/12.24783

1 March 1991 Model of a thin-film optical fiber fluorosensor

Claudio Oliveira Egalon, Robert S. Rogowski

Proceedings Volume 1368, Chemical, Biochemical, and Environmental Fiber Sensors II; (1991) https://doi.org/10.1117/12.24783
Event: SPIE Microelectronic Interconnect and Integrated Processing Symposium, 1990, San Jose, United States

Abstract

The efficiency of core-light injection from sources in the cladding of an optical fiber is modeled analytically by means of the exact field solution of a step-profile fiber. The analysis is based on the techniques by Marcuse (1988) in which the sources are treated as infinitesimal electric currents with random phase and orientation that excite radiation fields and bound modes. Expressions are developed based on an infinite cladding approximation which yield the power efficiency for a fiber coated with fluorescent sources in the core/cladding interface. Marcuse''s results are confirmed for the case of a weakly guiding cylindrical fiber with fluorescent sources uniformly distributed in the cladding, and the power efficiency is shown to be practically constant for variable wavelengths and core radii. The most efficient fibers have the thin film located at the core/cladding boundary, and fibers with larger differences in the indices of refraction are shown to be the most efficient.

Citation Download Citation

Claudio Oliveira Egalon and Robert S. Rogowski "Model of a thin-film optical fiber fluorosensor", Proc. SPIE 1368, Chemical, Biochemical, and Environmental Fiber Sensors II, (1 March 1991); https://doi.org/10.1117/12.24783

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