PLASMON-BASED TERAHERTZ-RANGE SPECTROMETER FOR EXAMINATION OF CONDUCTIVE SURFACE Russian patent published in 2008 - IPC G01J3/42 

FIELD: spectrometry.

SUBSTANCE: in accordance to the invention, spectrometer contains monochromatic radiation source of adjustable frequency with p-component differing from zero, and also controllable absorber of reference beam radiation. Examined surface of the specimen is made two-sided, where element for transformation of volumetric radiation to surface plasmon is positioned on one side, and element for transformation of surface plasmon to volumetric radiation is positioned on the other side of aforementioned surface, while the rib formed by two sides is rounded and has rounding radius not less than ten times greater than radiation wave length. As element for transformation of surface plasmon to volumetric radiation, additional flat mirror is used which is adjacent with its side to specimen surface and oriented at an angle to it, also coupled with second beam splitter and moved together with it along the surface of the specimen.

EFFECT: increased precision when determining complex refraction coefficient of surface plasmon.

2 dwg, 1 tbl