| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high analysis accuracy by keeping constant the intensity of the optical beam applied on the interface described below, without depending on an incident angle in the surface plasmon sensor, wherein the light beam is applied on the interface between a prism and a metal film so that the incident angle is variously changed, the intensity of the light beam totally reflected from the interface is measured and the material in a sample in contact with the metal film is analyzed. SOLUTION: This surface plasmon sensor is provided with and constituted of a prism 10, a metal film 12, which is formed on one surface of the prism and is made to be in contact with a sample 11, a light source 14, which generates a light beam 13, and a photodetector means 19, which detects the light beam 13 totally reflected from an interface 10a. In this case, the light beam 13 before the incidence into the prism 10 is deflected by an optical deflector 17 into the direction, in which the incident angle to the interface 10a is changed.
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