Tapered single-mode optical fiber evanescent coupling |
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Authors: | Fielding AJ Davis CC |
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Affiliation: | Dept. of Electr. & Comput. Eng., Univ. of Maryland, College Park, MD; |
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Abstract: | We describe the results of a numerical and experimental investigation of how a point source of radiation couples light to the HE 11 mode of a tapered single-mode fiber. Specifically, we have investigated two different geometries of nonadiabatic, tapered single-mode optical fiber. The motivation for this study is the characterization of a single-mode tapered optical fiber biosensor. In such a device light is collected from fluorescent sources located along the cladding surface of the tapered fiber. Taper-to-taper coupling measurements and fiber mode calculations indicate the device sensitivity decreases exponentially as sources are moved away from the tip of the tapered fiber |
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