Patent ID: 7906344

Claim:
A localized plasmon resonance sensor comprising: a sensor unit having a metal layer with a plurality of convex parts or concave parts formed by fixing metal particles having a diameter of between 10 and 30 nm at an interval of greater than or equal to two times and less than or equal to four times the diameter in average from each other on a surface of a transparent substrate, and molecule recognition functional substance for attaching a specific analyte immobilized on the substrate or the metal layer; and a light emitting module configured facing a back surface of the transparent substrate, such that a light emitted by the light emitting module reaches the metal layer passing through the transparent substrate; wherein the surface arranged with the metal layer and the molecule recognition functional substances of the sensor unit is contacted to an analysis sample solution containing analyte modified with the light emitting molecule; an evanescent light generated at the surface of the substrate by an excitation light irradiated at an incident angle totally reflected at the surface of the substrate onto the other surface of the sensor unit and the metal layer Plasmon resonate to locally intensify an electric field around the metal layer; and presence or concentration of the analyte attached to the molecule recognition functional substance is measured by detecting a luminescent light excited and emitted from the light emitting molecule of the analyte attached to the molecule recognition functional substance among the analytes with the electric field.