Accession Number : ADD015230

Title :   Waveguide-Binding Sensor for Use With Assays.

Descriptive Note : Patent, Filed 9 Nov 90, patented 29 Oct 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Thompson, Richard B ; Villarruel, Carl A

Report Date : 29 Oct 1991

Pagination or Media Count : 8

Abstract : An optical waveguide-binding sensor which increases sensor sensitivity to fluorescence detection during assays of liquids based on adjustments in the V number along the optical waveguide. The sensing waveguide includes a mode converting section where the V number of the waveguide gradually increases from the distal sensing end of the mode converting section to the proximal end of the mode converting section. The gradually change in V number can be accomplished by either gradually inwardly tapering waveguide along the sensor portion from the proximal end, or by gradually varying the dopant concentration along the sensing portion. Tne sensor tapers in diameter to change the V number along the distal end of the optical waveguide. The present invention increases the efficiency of fluorescence detection by converting weakly-guided high-order modes of fluorescence radiation at the distal end into lower-order modes at the proximal and increases the efficiency of fluorescent excitation by converting low order mode entering the proximal end into weakly-guided high order modes at the sensing end. At the sensing end, these weakly guided modes cn strengthen the evanescent excitation wave.

Descriptors :   *OPTICAL WAVEGUIDES, *PATENTS, DETECTION, DIAMETERS, EFFICIENCY, EXCITATION, FLUORESCENCE, INVENTIONS, LIQUIDS, NUMBERS, RADIATION, SENSITIVITY, WAVEGUIDES

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE