TERAHERTZ PLASMON FOURIER SPECTROMETER Russian patent published in 2013 - IPC G01J3/45 

FIELD: physics.

SUBSTANCE: spectrometer has a volume radiation source, a beam splitter which splits radiation into a measuring beam and reference beam, a mirror, a solid-state conducting sample with two flat faces interfaced by a rounded edge, an element, on one of said faces, for converting radiation of the measuring beam to a surface plasmon (SP), an element, on the other face of the sample, for converting the SP to volume radiation which is in form of a flat mirror adjoining the face and movable along the SP path, said mirror being oriented perpendicular to the path and inclined to the face, a second beam splitter which superimposes the beams and is interfaced with the inclined mirror which is movable together with the second beam splitter along the surface of the sample, a focusing lens, a photodetector, a second lens placed on the path of the superimposed beams, an information processing device, a delay line consisting of four corner mirrors, placed in pairs on the beam path. The corner mirrors, which reflect the measuring beam, are interfaced with the inclined mirror and the second beam splitter. The radiation source has a continuous spectrum.

EFFECT: cutting time for measuring the spectrum of the complex refractive index of surface plasmons.

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