Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses

Abstract We study theoretically a possibility of creation and ultrafast control (erasing, spatial frequency multiplication) of population density gratings in a multi-level resonant medium having a resonance transition frequency in the THz range. These gratings are produced by subcycle THz pulses coh...

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Autores principales:	Rostislav Arkhipov, Anton Pakhomov, Mikhail Arkhipov, Ihar Babushkin, Ayhan Demircan, Uwe Morgner, Nikolay Rosanov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/60728ab848044e2fa6934ce9fb996b54
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spelling	oai:doaj.org-article:60728ab848044e2fa6934ce9fb996b542021-12-02T13:50:50ZPopulation difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses10.1038/s41598-021-81275-82045-2322https://doaj.org/article/60728ab848044e2fa6934ce9fb996b542021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81275-8https://doaj.org/toc/2045-2322Abstract We study theoretically a possibility of creation and ultrafast control (erasing, spatial frequency multiplication) of population density gratings in a multi-level resonant medium having a resonance transition frequency in the THz range. These gratings are produced by subcycle THz pulses coherently interacting with a nonlinear medium, without any need for pulses to overlap, thereby utilizing an indirect pulse interaction via an induced coherent polarization grating. High values of dipole moments of the transitions in the THz range facilitate low field strength of the needed THz excitation. Our results clearly show this possibility in multi-level resonant media. Our theoretical approach is based on an approximate analytical solution of time-dependent Schrödinger equation (TDSE) using perturbation theory. Remarkably, as we show here, quasi-unipolar subcycle pulses allow more efficient excitation of higher quantum levels, leading to gratings with a stronger modulation depth. Numerical simulations, performed for THz resonances of the $$H_20$$ H 2 0 molecule using Bloch equations for density matrix elements, are in agreement with analytical results in the perturbative regime. In the strong-field non-perturbative regime, the spatial shape of the gratings becomes non-harmonic. A possibility of THz radiation control using such gratings is discussed. The predicted phenomena open novel avenues in THz spectroscopy of molecules with unipolar and quasi-unipolar THz light bursts and allow for better control of ultra-short THz pulses.Rostislav ArkhipovAnton PakhomovMikhail ArkhipovIhar BabushkinAyhan DemircanUwe MorgnerNikolay RosanovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rostislav Arkhipov Anton Pakhomov Mikhail Arkhipov Ihar Babushkin Ayhan Demircan Uwe Morgner Nikolay Rosanov Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses
description	Abstract We study theoretically a possibility of creation and ultrafast control (erasing, spatial frequency multiplication) of population density gratings in a multi-level resonant medium having a resonance transition frequency in the THz range. These gratings are produced by subcycle THz pulses coherently interacting with a nonlinear medium, without any need for pulses to overlap, thereby utilizing an indirect pulse interaction via an induced coherent polarization grating. High values of dipole moments of the transitions in the THz range facilitate low field strength of the needed THz excitation. Our results clearly show this possibility in multi-level resonant media. Our theoretical approach is based on an approximate analytical solution of time-dependent Schrödinger equation (TDSE) using perturbation theory. Remarkably, as we show here, quasi-unipolar subcycle pulses allow more efficient excitation of higher quantum levels, leading to gratings with a stronger modulation depth. Numerical simulations, performed for THz resonances of the $$H_20$$ H 2 0 molecule using Bloch equations for density matrix elements, are in agreement with analytical results in the perturbative regime. In the strong-field non-perturbative regime, the spatial shape of the gratings becomes non-harmonic. A possibility of THz radiation control using such gratings is discussed. The predicted phenomena open novel avenues in THz spectroscopy of molecules with unipolar and quasi-unipolar THz light bursts and allow for better control of ultra-short THz pulses.
format	article
author	Rostislav Arkhipov Anton Pakhomov Mikhail Arkhipov Ihar Babushkin Ayhan Demircan Uwe Morgner Nikolay Rosanov
author_facet	Rostislav Arkhipov Anton Pakhomov Mikhail Arkhipov Ihar Babushkin Ayhan Demircan Uwe Morgner Nikolay Rosanov
author_sort	Rostislav Arkhipov
title	Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses
title_short	Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses
title_full	Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses
title_fullStr	Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses
title_full_unstemmed	Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses
title_sort	population difference gratings created on vibrational transitions by nonoverlapping subcycle thz pulses
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/60728ab848044e2fa6934ce9fb996b54
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Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses

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