Changes in the Spectral Characteristics of Some Polymeric Materials in the Frequency Range from 0.2 to 2 THz as a Result of Exposure to a Megawatt Flux of Submillimeter Radiation of Microsecond Duration

The effect of exposure to pulsed megawatt submillimeter (0.1-0.4 THz) radiation fluxes on the spectral characteristics of some thin-film polymer materials in the frequency range from 0.2 to 2 THz has been registered. The polymer samples have been characterized using technical solutions within the framework of time-domain-spectroscopy and BWO spectroscopy. For the exposure, a radiation flux in the submillimeter wavelength range with duration of about 4 µs generated during beam-plasma interaction at the GOL-PET facility (BINP SB RAS) has been used. Relative changes in the real part of the permittivity of individual polyvinylidene fluoride samples is found to reach a level of 0.5 with an initial value of about 3.0, while for polyvinyl chloride samples no changes in this parameter have been registered. At the same time, for polyurea individual samples, both significant changes in this parameter and its insignificant changes as a result of exposure have been observed. The results of the experiments provide a basis for using thin-film polymeric materials as substrates for samples of supramolecular complexes, which during research will be exposed to powerful pulsed radiation fluxes in the submillimeter wavelength range.