Two-dimensional WSe2 flakes under high power optical excitation

Quasi-2D layers of transition metal dichalcogenides are promising candidates for creating saturable absorbers for pulsed lasers. However, the peculiarities of intense electromagnetic radiation’s influence on such structures have not been thoroughly studied. This paper explores the dynamics of photoe...

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Autores principales:	Kirill Brekhov, Sergey Lavrov, Andrey Kudryavtsev, Nikita Ilyin
Formato:	article
Lenguaje:	EN
Publicado:	Pensoft Publishers 2021
Materias:	Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/dd85ddd33cc2433384c674890073521a
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spelling	oai:doaj.org-article:dd85ddd33cc2433384c674890073521a2021-12-03T04:30:37ZTwo-dimensional WSe2 flakes under high power optical excitation10.3897/j.moem.7.3.742742452-1779https://doaj.org/article/dd85ddd33cc2433384c674890073521a2021-09-01T00:00:00Zhttps://moem.pensoft.net/article/74274/download/pdf/https://moem.pensoft.net/article/74274/download/xml/https://moem.pensoft.net/article/74274/https://doaj.org/toc/2452-1779Quasi-2D layers of transition metal dichalcogenides are promising candidates for creating saturable absorbers for pulsed lasers. However, the peculiarities of intense electromagnetic radiation’s influence on such structures have not been thoroughly studied. This paper explores the dynamics of photoexcited carriers in WSe2 flakes through experimental studies. These studies found that WSe2 flakes significantly change their optical properties under the influence of a high-power optical pump, allowed estimating the thermalization time of these structures (about 2 ps), and found that full relaxation takes more than 10 ps. The concentration of carriers in the semiconductor surface layer was estimated to be about 1028 m–3. It was found that standard description models of the optical response based on exciton resonances and absorption by free carriers could not adequately describe the experiments’ results. Thus, for an accurate description of the optical response, it was necessary to consider the effects associated with Coulomb screening that are caused by the high concentration of photo-excited carriers of the optical pumping densities used in this experiment.Kirill BrekhovSergey LavrovAndrey KudryavtsevNikita IlyinPensoft PublishersarticleElectronicsTK7800-8360ENModern Electronic Materials, Vol 7, Iss 3, Pp 109-113 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Electronics TK7800-8360
spellingShingle	Electronics TK7800-8360 Kirill Brekhov Sergey Lavrov Andrey Kudryavtsev Nikita Ilyin Two-dimensional WSe2 flakes under high power optical excitation
description	Quasi-2D layers of transition metal dichalcogenides are promising candidates for creating saturable absorbers for pulsed lasers. However, the peculiarities of intense electromagnetic radiation’s influence on such structures have not been thoroughly studied. This paper explores the dynamics of photoexcited carriers in WSe2 flakes through experimental studies. These studies found that WSe2 flakes significantly change their optical properties under the influence of a high-power optical pump, allowed estimating the thermalization time of these structures (about 2 ps), and found that full relaxation takes more than 10 ps. The concentration of carriers in the semiconductor surface layer was estimated to be about 1028 m–3. It was found that standard description models of the optical response based on exciton resonances and absorption by free carriers could not adequately describe the experiments’ results. Thus, for an accurate description of the optical response, it was necessary to consider the effects associated with Coulomb screening that are caused by the high concentration of photo-excited carriers of the optical pumping densities used in this experiment.
format	article
author	Kirill Brekhov Sergey Lavrov Andrey Kudryavtsev Nikita Ilyin
author_facet	Kirill Brekhov Sergey Lavrov Andrey Kudryavtsev Nikita Ilyin
author_sort	Kirill Brekhov
title	Two-dimensional WSe2 flakes under high power optical excitation
title_short	Two-dimensional WSe2 flakes under high power optical excitation
title_full	Two-dimensional WSe2 flakes under high power optical excitation
title_fullStr	Two-dimensional WSe2 flakes under high power optical excitation
title_full_unstemmed	Two-dimensional WSe2 flakes under high power optical excitation
title_sort	two-dimensional wse2 flakes under high power optical excitation
publisher	Pensoft Publishers
publishDate	2021
url	https://doaj.org/article/dd85ddd33cc2433384c674890073521a
work_keys_str_mv	AT kirillbrekhov twodimensionalwse2flakesunderhighpoweropticalexcitation AT sergeylavrov twodimensionalwse2flakesunderhighpoweropticalexcitation AT andreykudryavtsev twodimensionalwse2flakesunderhighpoweropticalexcitation AT nikitailyin twodimensionalwse2flakesunderhighpoweropticalexcitation
_version_	1718373959696646144

Two-dimensional WSe2 flakes under high power optical excitation

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