Surface plasmon resonance is a phenomenon of physical optics.The evanescent wave produced by a incident light wave occuring total internal reflection phenomenon at the interface between medium and metal film,is used to stimulate surface plasmon wave propagating along the interface between environmental medium and metal film.When the incident angle or incident wavelength equals to a certain value,the wavevector of surface plasmon wave will equal to evanescent wave,and the resonance will occur.By this time,en...