Fluence and wavelength dependent ultrafast differential transmission dynamics in graphene
We performed degenerate pump-probe transmission measurements of graphene supported on glass for a range of pump fluences that enable us to observe both positive and negative deferential transmission dynamics. Our results show that at an intermediate pump fluence, where a transition from negative to...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/abb5f2 |
| _version_ | 1827868647912112128 |
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| author | Rustam Gatamov Andrey Baydin Halina Krzyzanowska Norman Tolk |
| author_facet | Rustam Gatamov Andrey Baydin Halina Krzyzanowska Norman Tolk |
| author_sort | Rustam Gatamov |
| collection | DOAJ |
| description | We performed degenerate pump-probe transmission measurements of graphene supported on glass for a range of pump fluences that enable us to observe both positive and negative deferential transmission dynamics. Our results show that at an intermediate pump fluence, where a transition from negative to positive response occurs, the differential transmission dynamics is an order of magnitude faster than at higher and lower pump fluences. This effect can be explained by equal contributions of inter- and intraband transitions with opposite signs to the transient optical conductivity of graphene at an intermediate pump fluence. Moreover, the intermediate threshold pump fluence is shown to increase with decreasing probe energy, which is in agreement with the theoretical model. Furthermore, we show that the relaxation time of the electronic temperature increases monotonically over the range of fluences studied. In perspective, this work is of importance to graphene-based opto-electronic applications such as light modulators. |
| first_indexed | 2024-03-12T15:34:23Z |
| format | Article |
| id | doaj.art-58bede89592d4ee296591b97eabd03eb |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:34:23Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-58bede89592d4ee296591b97eabd03eb2023-08-09T16:17:53ZengIOP PublishingMaterials Research Express2053-15912020-01-017909560110.1088/2053-1591/abb5f2Fluence and wavelength dependent ultrafast differential transmission dynamics in grapheneRustam Gatamov0https://orcid.org/0000-0003-3410-7263Andrey Baydin1Halina Krzyzanowska2Norman Tolk3Department of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, United States of AmericaDepartment of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, United States of AmericaDepartment of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, United States of America; Maria Curie-Sklodowska University , Pl. M. Cuire-Sklodowskiej 1, 20-031 Lublin, PolandDepartment of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, United States of AmericaWe performed degenerate pump-probe transmission measurements of graphene supported on glass for a range of pump fluences that enable us to observe both positive and negative deferential transmission dynamics. Our results show that at an intermediate pump fluence, where a transition from negative to positive response occurs, the differential transmission dynamics is an order of magnitude faster than at higher and lower pump fluences. This effect can be explained by equal contributions of inter- and intraband transitions with opposite signs to the transient optical conductivity of graphene at an intermediate pump fluence. Moreover, the intermediate threshold pump fluence is shown to increase with decreasing probe energy, which is in agreement with the theoretical model. Furthermore, we show that the relaxation time of the electronic temperature increases monotonically over the range of fluences studied. In perspective, this work is of importance to graphene-based opto-electronic applications such as light modulators.https://doi.org/10.1088/2053-1591/abb5f2grapheneultrafast pump-probe spectroscopydifferential transmission dynamics |
| spellingShingle | Rustam Gatamov Andrey Baydin Halina Krzyzanowska Norman Tolk Fluence and wavelength dependent ultrafast differential transmission dynamics in graphene Materials Research Express graphene ultrafast pump-probe spectroscopy differential transmission dynamics |
| title | Fluence and wavelength dependent ultrafast differential transmission dynamics in graphene |
| title_full | Fluence and wavelength dependent ultrafast differential transmission dynamics in graphene |
| title_fullStr | Fluence and wavelength dependent ultrafast differential transmission dynamics in graphene |
| title_full_unstemmed | Fluence and wavelength dependent ultrafast differential transmission dynamics in graphene |
| title_short | Fluence and wavelength dependent ultrafast differential transmission dynamics in graphene |
| title_sort | fluence and wavelength dependent ultrafast differential transmission dynamics in graphene |
| topic | graphene ultrafast pump-probe spectroscopy differential transmission dynamics |
| url | https://doi.org/10.1088/2053-1591/abb5f2 |
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