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

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Abstract

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.

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A. V. Arzhannikov

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

S. L. Sinitsky

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

D. A. Samtsov

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

P. V. Kalinin

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

S. A. Kuznetsov

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

V. D. Stepanov

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

S. S. Popov

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

E. S. Sandalov

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

M. G. Atlukhanov

Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

A. V. Stankevich

Zababakhin All-Russia Research Institute of Technical Physics; Postovsky Institute of Organic Synthesis of the Ural Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Snezhinsk; Ekaterinburg

A. V. Pestov

Postovsky Institute of Organic Synthesis of the Ural Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Ekaterinburg

N. A. Nikolaev

Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

A. A. Rybak

Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences

Email: A.V.Arzhannikov@inp.nsk.su
Russian Federation, Novosibirsk

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2. Fig. 1. Scheme of spectroscopic measurements in the time domain (a) and an example of processing the results of registration of the reference signal (1) and the signal in the presence of the sample (2) within the framework of the used technique (b). FFT - fast Fourier transform.

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3. Fig. 2. Schematic of spectroscopic measurements in the frequency domain (a) and the frequency interval available with different LOVs under frequency multiplication conditions (b).

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4. Fig. 3. Scheme of irradiation of samples with a powerful stream of submillimetre radiation (a): 1 - electron beam; 2 - plasma column; 3 - THz radiation flux; 4 - mirror for THz radiation flux; 5 - sample package; 6 - neon lamp panel; 7 - polychromator. Display of the radiation flux cross-section through the luminescence of gas-discharge neon bulbs assembled in a panel, without a sample package (top) and in the presence of a sample package (bottom) (b).

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5. Fig. 4. Spectral composition of the flux recorded by the polychromator, in the absence of samples (a) and under conditions when it passes through the package with samples of the materials under study (b).

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6. Fig. 5. Change in the real part of the dielectric permittivity of polyvinyl chloride (a) and polyvinylidene fluoride (b) as a result of exposure to a stream of submillimetre radiation (a series of five pulses) obtained by time domain spectroscopy (solid lines) and LOV spectroscopy (symbols) before exposure to radiation (1) and after (2).

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7. Fig. 6. Change in the real part of dielectric permittivity of polyurea samples No. 1581 (a) and No. 1580 (b) as a result of exposure to a stream of submillimetre radiation (two pulses), obtained by time domain spectroscopy (solid lines) and LOV spectroscopy (symbols) before exposure to radiation (1) and after (2).

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8. Fig. 7. Change in the real part of dielectric permittivity of samples No. 1584 (a) and No. 1585 (b) made of polytetrafluoroethylene as a result of exposure to a stream of submillimetre radiation (five pulses), obtained by time domain spectroscopy (solid lines) and LOV spectroscopy (symbols) before exposure to radiation (1) and after (2).

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