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

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 i...

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Autores principales: Arkhipov, Rostislav, Pakhomov, Anton, Arkhipov, Mikhail, Babushkin, Ihar, Demircan, Ayhan, Morgner, Uwe, Rosanov, Nikolay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820408/
https://www.ncbi.nlm.nih.gov/pubmed/33479279
http://dx.doi.org/10.1038/s41598-021-81275-8
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author Arkhipov, Rostislav
Pakhomov, Anton
Arkhipov, Mikhail
Babushkin, Ihar
Demircan, Ayhan
Morgner, Uwe
Rosanov, Nikolay
author_facet Arkhipov, Rostislav
Pakhomov, Anton
Arkhipov, Mikhail
Babushkin, Ihar
Demircan, Ayhan
Morgner, Uwe
Rosanov, Nikolay
author_sort Arkhipov, Rostislav
collection PubMed
description 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 [Formula: see text] 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.
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spelling pubmed-78204082021-01-22 Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses Arkhipov, Rostislav Pakhomov, Anton Arkhipov, Mikhail Babushkin, Ihar Demircan, Ayhan Morgner, Uwe Rosanov, Nikolay Sci Rep Article 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 [Formula: see text] 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. Nature Publishing Group UK 2021-01-21 /pmc/articles/PMC7820408/ /pubmed/33479279 http://dx.doi.org/10.1038/s41598-021-81275-8 Text en © The Author(s) 2021 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Arkhipov, Rostislav
Pakhomov, Anton
Arkhipov, Mikhail
Babushkin, Ihar
Demircan, Ayhan
Morgner, Uwe
Rosanov, Nikolay
Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses
title 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_short 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
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820408/
https://www.ncbi.nlm.nih.gov/pubmed/33479279
http://dx.doi.org/10.1038/s41598-021-81275-8
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