Optics: measuring and testing – Of light reflection
Patent
1996-10-25
1998-10-13
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
G01N 2117
Patent
active
058220739
ABSTRACT:
The present invention relates in general to SPR sensors in which the sensing element is a planar lightpipe. More specifically, a planar lightpipe sensor configuration for measurement of SPR at a single angle operation is provided. The lightpipe of this sensor is beveled to facilitate coupling of substantially collimated white light, preferably TM polarized white light, at a selected single angle that excites SPR at the sensing area. Angle of incidence on the SPR sensing area is determined by bevel angle used. This embodiment is a zero order sensor in the sense that it allows measurement for a given analyte at only a single angle of incidence. In this embodiment, however, the lightpipe can have a plurality of SPR sensing area across its width to provide for multichannel sensing. Refractive index sensitivity of this configuration is estimated as 4.times.10.sup.-5 RI units.
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Johnston Kyle
Shen Shuai
Yee Sinclair S.
McGraw Vincent P.
University of Washington
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