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Effect Of Numerical Aperture On Signal Level In Cylindrical Waveguide Evanescent Fluorosensors.

Thomas R. Glass, Steve Lackie, T. Hirschfeld
Published 1987 · Physics, Medicine

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The effect of numerical aperture on signal level from fluorescent substances or solutions in the evanescent zone of a cylindrical waveguide is analyzed. The analysis applies to the case in which the fluorescence is excited by the evanescent wave of a fiber and the fluorescence signal is that which tunnels back into the same fiber. The analysis is for two cases: bulk fluorescence and fluorescence of a thin film layer. Experimental results are also presented.
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