| 摘要 |
PROBLEM TO BE SOLVED: To measure a surface plasmon resonance at high sensitivity by raising a light usage efficiency and to prevent generation of noise due to speckle, related to a surface plasmon sensor in which a light beam is converged at the interface between a dielectric block and a metal film. SOLUTION: The surface plasmon sensor comprises a dielectric block 13, a metal film 14 which is formed on one surface of the dielectric block 13 and allowed to contact a sample 15, a light source 16 which emits light beam L, incident optical systems 17 and 18 which allow the light beam L to enter so as to converge at an interface 13a between the dielectric block 13 and the metal film 14, and a light detecting means which measures the intensity of the light beam L which is totally reflected on the interface 13a. The light detecting means comprises a cylindrical lens 20 which condenses the light beam L, which is totally reflected, in the direction where components of different reflection angles continues in one direction as a line, and a light detector 21 which comprises a light receiving part extending in the line direction and detects the light beam L which is condensed in the line.
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