Patent ID: 7224451
Filing Date: 2007-05-29
Classification: G01N

Abstract:
1. A Raman spectroscopy method in which a spectrum is obtained by separating scattering light obtained by projecting light of a wavelength of λ onto a material and light having a wavelength different from λ is detected, the method comprising the steps of causing the surface of metal film which is formed on a dielectric substrate in thickness of 50 to 200 nm and is characterized in that a plurality of fine holes satisfying the conditions defined by the following formulae are formed to adsorb the material to be analyzed, projecting light onto the surface and separating the scattering light scattered by the surface to obtain a spectrum of the scattering light, wherein λ represents the wavelength of the projected light, a represents the cycle of the fine holes, d represents the diameter of the fine holes, ε 1 represents the dielectric constant of the metal film and ε 2 represents the dielectric constant of the medium around the surface of the metal film.