Patent ID: 8705039

Claim:
A surface plasmon resonance sensor comprising: a vertical illuminating focused-beam ellipsometer, in which light is polarized, a part of the polarized light is focused to a metal thin film by using a surface plasmon resonance (SPR) sensing part, and then the polarized light reflected from the metal thin film is detected; the surface plasmon resonance (SPR) sensing part provide to generate SPR according to an angle change of the polarized light, the SPR sensing part including: a first lens which is a converging lens for focusing a part of the polarized light; and a second lens which is formed of a spherical lens or an aspherical lens, or a combination of a spherical lens and an aspherical lens so as to have the metal thin film deposited at a lower side thereof; and a flow unit which supplies a buffer solution containing a bio material binding to or dissociation from the metal thin film generating surface plasmon, wherein the SPR by change in an angle and a wavelength and the ellipsometric phase change are simultaneously detected by an optical detector.