Optical detector including Bragg waveguide structure

Details Optical detector including Bragg waveguide structure Optical detector including Bragg waveguide structure

1995-02-14

1996-11-05

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356410, 356436, 385 12, G01N 2105, G01N 2185

Patent

active

055723284

ABSTRACT:
An optical detector for use in liquid chromatography systems or capillary electrophoresis systems comprises an optically transparent detector body through which an analyte channel extends, a fluid containing the analyte being adapted to be guided through said analyte channel. In order to increase the detection sensitivity, the light path between a light source introducing light and an optoelectric sensor element of the liquid chromatography system or capillary electrophoresis system is constructed as a Bragg waveguide structure extending at least along a sublength of said analyte channel essentially in the channel direction.

REFERENCES:
patent: 4880752 (1989-11-01), Keck et al.
patent: 5273633 (1993-12-01), Wang et al.
EPO Search Report, EP 94 10 6551, Oct. 1994.
A Microfabricated Flow Chamber For Optical Measurements In Fluids, Sobek et al., Jul. 2, 1993, 219-224, proceedings of Micro Electro Mechanical Systems, Feb. 1993.
Database WPI, Section Ch., Week 9144, Derwent Publications Ltd., London, GB; Class JO4, AN 91-322901 & SU-A-1 610 410 (Biolog Appts Res In) 30 Nov. 1990, abstract.
A Silicon Flow Cell For Optical Detection In Miniaturized Total Chemical Analysis Systems, Verpoorte et al., 8253b Sensors & Actuators, B Chemical Jan. 1992, pp. 66-70.
Low-Loss Antiresonant Reflecting Optical Waveguide On Si Substrate In Visible-Wavelength Region, Kokubun, Y., Electronics Letters, Aug. 14, 1986, vol. 22 No. 17, pp. 892-893.

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