Surface plasmon sensor having a coupler with a refractive index

Details Surface plasmon sensor having a coupler with a refractive index Surface plasmon sensor having a coupler with a refractive index

1998-02-04

1999-07-13

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356244, H01J 516

Patent

active

059230312

ABSTRACT:
A surface plasmon sensor comprises a sensor unit, which is provided with a transparent substrate and a metal film, and a coupler, which carries out light beam coupling and is separate from the sensor unit. A light beam is entered from a light beam entry portion of the coupler, and an attenuated total reflection angle .theta..sub.sp is detected from the light beam, which has been totally reflected from an interface between the transparent substrate and the metal film and has then been radiated out of a light beam radiating portion of the coupler. The sensor unit is supported by a sensor unit attachment such that a distance between the transparent substrate and the coupler may be kept to be equal to a predetermined value. The space between the transparent substrate and the coupler is filled with a refractive index matching liquid. Fitting of the sensor unit in the surface plasmon sensor is easy to carry out, and the relationship between positions of the sensor unit and the coupler can be kept constant.

REFERENCES:
patent: 5035863 (1991-07-01), Finlan et al.
patent: 5164589 (1992-11-01), Sjodin
J.D. Richards et al: "Surface-Plasmon Excitation Using a Polarization-Preserving Optical Fiber and an Index-matching fluid optical cell", Jun. 1, 1993, Applied Optics, vol. 32, NR. 16, pp. 2901-2906.

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