najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-1334Research ArticlePHYSICSФИЗИКАSpatial-time pattern of electrical field of terahertz pulse in the far fieldKulyaM. S.

Saint Petersburg

maxk2350@yandex.ruGrachevYa. V.

Saint Petersburg

BespalovV. G.

Saint Petersburg

victorbespaloff@gmail.comKujanpaaV. P.veli.kujanpaa@vtt.fiSt. Petersburg National Research University of Information Technologies, Mechanics and OpticsRussian FederationSt. Petersburg National Research University of Information Technologies, Mechanics and OpticsRussian FederationVTT Technical Research Centre of FinlandFinland20132208202542206213Copyright © Kulya M.S., Grachev Y.V., Bespalov V.G., Kujanpaa V.P., 20252025Kulya M.S., Grachev Y.V., Bespalov V.G., Kujanpaa V.P.Kulya M.S., Grachev Y.V., Bespalov V.G., Kujanpaa V.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1334

The spatial and temporal dependence of the electric field amplitude of a terahertz (THz) pulse of several oscillations in the far field near the focal plane of a parabolic mirror was experimentally obtained. During experimentation a space-time anomaly was discovered in the diffraction patterns. In the wave front of the field the amplitude decreases to zero, and going through this spatial plane, the phase of oscillations changes, while in the integrated intensity, there is a dip in the curve. The results can be applied in pulsed terahertz optics and spectroscopy.

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The authors declare that there are no conflicts of interest present.