Patent ID: 8268613

Claim:
A surface plasmon resonance measuring chip for use in a surface plasmon resonance measurement apparatus constituted of a light source for emitting a light beam; an optical system for making said light beam enter a dielectric block at various angles of incidence so that a condition for total internal reflection is satisfied at an interface between said dielectric block and a metal film; and photodetection means for detecting the intensity of said light beam satisfying total internal reflection at said interface to detect surface plasmon resonance; comprising: a dielectric block; a metal film, formed on a surface of said dielectric block, for placing a sample thereon; wherein said dielectric block is formed as a single block that includes an entrance surface which said light beam enters, an exit surface from which said light beam emerges, and a surface on which said metal film is formed; said metal film is united with said dielectric block; said dielectric block is formed from a synthetic resin in which, when said light beam is p-polarized outside said dielectric block and then strikes said interface, the intensity of an s-polarized component at said interface is 50% or less of the intensity of said light beam at said interface; and said dielectric block has a cut out portion in a region where said light beam does not penetrate.