Patent ID: 7839508

Claim:
A surface plasmon resonance sensor comprising: a surface plasmon resonance sensor chip; a light source for irradiating light onto the surface plasmon resonance sensor chip; and a photodetector for receiving light reflected by the surface plasmon resonance sensor chip; wherein the surface plasmon resonance sensor chip comprises: a substrate, a metal layer formed so as to cover at least one part of a surface of the substrate, and a plurality of concave parts being formed in the metal layer, wherein the metal layer has a bottom surface in contact with the substrate and a top surface opposite to the bottom surface, and wherein the concave parts have at least one set of opposing side wall faces causing a local resonance electric field to be generated between the side wall faces when light is received at the top surface of the metal layer; the light is exited from the light source, entered to the surface of the sensor chip, reflected at a measurement region of the top surface of the metal layer including the concave parts, and received by the photodetector to measure a reflectance in the sensor chip or a light intensity received at the photodetector.