FIELD: physics.
SUBSTANCE: method of controlling the spectrum of a beam of wideband terahertz (THz) radiation involves placing a selective absorbing filter on the beam path. The radiation is linearly polarised and filter used is a conducting surface. The polarised radiation is converted to a beam of surface-directed surface plasmons which, after travelling a macroscopic distance on the surface of the plate, is converted to a beam of bulk electromagnetic waves and the desired amplitude-frequency distribution of harmonic components in the beam of bulk electromagnetic waves is achieved by varying the distance travelled the beam of surface plasmons on the surface of the plate.
EFFECT: rapid control of the amplitude-frequency spectrum of the beam in the entire THz range.
2 dwg
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