Formation of spatio-frequency modulation in a terahertz pulse generated in an indium arsenide crystal

Nabilkova, A.O., Oparin, E.N., Shumigai, V.S., Melnik, M.V., Tsypkin, A.N.

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For Russian citation (Opticheskii Zhurnal):

Набилкова А.О., Опарин Е.Н., Шумигай В.С., Мельник М.В., Цыпкин А.Н. Формирование пространственно-частотной модуляции в терагерцовом импульсе при его генерации в кристалле арсенида индия// Оптический журнал. 2022. Т. 89. № 11. С. 17–23. http://doi.org/ 10.17586/1023-5086-2022-89-11-17-23

Nabilkova A.O., Oparin E.N., Shumigai V.S., Melnik M.V., Tcypkin A.N. Formation of spatio-frequency modulation in a terahertz pulse generated in an indium arsenide crystal [in Russian] // Opticheskii Zhurnal. 2022. V. 89. № 11. P. 17–23. http://doi.org/10.17586/1023-5086-2022-89-11-17-23

For citation (Journal of Optical Technology):

A. O. Nabilkova, E. N. Oparin, V. S. Shumigai, M. V. Melnik, and A. N. Tcypkin, "Formation of spatio-frequency modulation in a terahertz pulse generated in an indium arsenide crystal," Journal of Optical Technology. 89(11), 651-655 (2022). https://doi.org/10.1364/JOT.89.000651

Abstract:

Subject of study. Spatio-frequency modulation of a terahertz field generated in a crystal was investigated. Aim of study. The study aimed to theoretically and experimentally analyze the effect of spatio-frequency modulation of one-and-a-half-cycle and multi-cycle pulses in the terahertz spectral range. Method. The spatial distribution of the terahertz field spectrum was measured using time-domain spectroscopy. The process of propagation of radiation of one-and-a-half-cycle and multi-cycle pulses in air was simulated using the angular spectrum method. Main results. The spatial localization features of broadband terahertz radiation during its generation were demonstrated theoretically and experimentally. A spatio-frequency modulation distinctive to few-cycle pulses was revealed, which involves the propagation of high frequencies closer to the beam axis, whereas low frequencies propagate farther from the axis. This effect was observed exclusively for the pulses consisting of a small number of field oscillations. Propagation of multi-cycle pulses is not accompanied with such a modulation. Practical significance. This effect should be considered in the experiments sensitive to the spatial distribution of the terahertz radiation field. Such applications include terahertz imaging, terahertz holography, and the development of commercial and scientific sources of terahertz radiation.

Keywords:

terahertz radiation, terahertz radiation generation, Dember photoeffect, radiation diffraction, spatial-frequency modulation

Acknowledgements:

The research was supported by RSF within the grant No. МНК-NSFC (2022).

OCIS codes: 050.1590, 040.2235

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