Fecha de publicación: 25/05/2006 Fuente: Wipo "Sensorization" A chemical sensor for detecting a reaction of a sensor material with a specimen on the basis of an intensity of a surface plasmon polariton wave propagated along a surface of a sensor medium including the sensor material is principally constituted by the sensor medium. The sensor medium includes a periodic structure and the sensor material disposed on the periodic structure. The periodic structure has a pitch substantially equal to an integral multiple of a wavelength of the surface plasma polariton wave generated by irradiating an interface between the periodic structure and the sensor material with light.