Ellipso sensor using a prism

Details Ellipso sensor using a prism Ellipso sensor using a prism

1998-04-29

1999-01-05

Font, Frank G.

Optics: measuring and testing

By polarized light examination

Of surface reflection

G01J 400

Patent

active

058568735

ABSTRACT:
A surface plasmon sensor comprises a prism, a metal film, which is formed on one surface of the prism and is brought into contact with a sample, and a light source for producing a light beam. An optical system causes the light beam to pass through the prism and to impinge upon an interface between the prism and the metal film such that various different angles of incidence may be obtained with respect to the interface. A photodetector detects an intensity of the light beam, which has been totally reflected from the interface, with respect to each of the various different angles of incidence. An electrode stands facing the metal film with a liquid sample intervening therebetween, and a DC voltage is applied across the electrode and the metal film. A substance contained in the liquid sample is thus analyzed quickly and with a high sensitivity.

REFERENCES:
patent: 4908508 (1990-03-01), Dubbeldam
patent: 5141311 (1992-08-01), Hickel et al.
"Wall-Induced Orientational Order of a Liquid Crystal in the Isotropic Phase-an Evanescent-Wave-Ellipsometry Study", Hsiung et al., Physical Review Letters, vol. 57, No. 24, Dec. 15, 1986, pp. 3065-3068.

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