Optical wave guide

Details Optical wave guide Optical wave guide

G - Physics

02

B

88/97.2

G02B 6/24 (2006.01) G01N 21/64 (2006.01) G01N 21/77 (2006.01) G02B 6/42 (2006.01)

Patent

CA 1264971

ABSTRACT An optical wave guide particularly useful in assay apparatus employing total internal reflection of excita- tion radiation at the interface between the wave guide and a surrounding liquid phase of lower index of refraction. The wave guide in the form of a solid, light-transmissive, elongated rod or fiber made typically of glass, crystal or plastic and having preferably a circular cross section, is tapered gradually from an entrance face of relatively large diameter to a substantially smaller diameter at some position longitudinally displaced from the entrance face. In one form, the wave guide is formed with a tapering conical input portion coupled to a second portion having a cylindrical configuration and a diameter matched to the smaller diameter of the tapered portion.

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