Development of the surface plasmon-polaritons absorption spectrometry method in the terahertz range

The article describes achievements in the development of devices for the generation of surface plasmon-polaritons (SPPs) of the terahertz (THz) range by radiation of the external source tunable in frequency, as well as for measuring the field of SPPs and determining their propagation length. The characteristic high signal-to-noise ratio scheme of the absorption SPP spectrometer with fixed radiation coupling elements and a mirror delay line for changing the SPP run distance is implemented.