METHOD OF CONTROLLING SPECTRUM OF BEAM OF WIDEBAND TERAHERTZ RADIATION Russian patent published in 2017 - IPC G02F1/01 G02B5/20 

FIELD: physics.

SUBSTANCE: method includes placing a selectively absorbing filter in the form of the surface of a conductive plate in the path of the radiation beam, imparting p-polarization to the radiation, converting the polarized radiation into a beam of surface plasmon-polaritons guided by the surface, converting the plasmon-polaritons after traversing them over a plate of macroscopic distance in volumetric electromagnetic waves. In this case, the beam of plasmon-polaritons is reflected by a plane mirror adjacent to the surface of the plate and deflected in the plane of its surface from the normal to the track of the beam. The regulation of the upper limit of the spectrum by varying the mean of free path of plasmon polaritons, and the adjustment of the lower boundary of the spectrum is effected by varying the angle of inclination of the mirror to the surface of the plate.

EFFECT: providing the possibility of operational control of both the upper and lower limits of the spectrum of terahertz radiation.

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