Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region

We investigate theoretically the two-photon absorption (TPA) for circular graphene quantum dots (GQDs) with the edge of armchair and zigzag on the basis of electronic energy states obtained by solving the Dirac-Weyl equation numerically under finite difference method. The expressions for TPA cross s...

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Detalles Bibliográficos
Autores principales: Feng, Xiaobo, Li, Zhisong, Li, Xin, Liu, Yingkai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5024087/
https://www.ncbi.nlm.nih.gov/pubmed/27629800
http://dx.doi.org/10.1038/srep33260
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author Feng, Xiaobo
Li, Zhisong
Li, Xin
Liu, Yingkai
author_facet Feng, Xiaobo
Li, Zhisong
Li, Xin
Liu, Yingkai
author_sort Feng, Xiaobo
collection PubMed
description We investigate theoretically the two-photon absorption (TPA) for circular graphene quantum dots (GQDs) with the edge of armchair and zigzag on the basis of electronic energy states obtained by solving the Dirac-Weyl equation numerically under finite difference method. The expressions for TPA cross section are derived and the transition selection rules are obtained. Results reveal that the TPA is significantly greater in GQDs than conventional semiconductor QDs in infrared spectrum (2–6 um) with a resonant TPA cross section of up to 10(11 )GM. The TPA peaks are tuned by the GQDs’ size, edge and electron relaxation rate.
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spelling pubmed-50240872016-09-20 Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region Feng, Xiaobo Li, Zhisong Li, Xin Liu, Yingkai Sci Rep Article We investigate theoretically the two-photon absorption (TPA) for circular graphene quantum dots (GQDs) with the edge of armchair and zigzag on the basis of electronic energy states obtained by solving the Dirac-Weyl equation numerically under finite difference method. The expressions for TPA cross section are derived and the transition selection rules are obtained. Results reveal that the TPA is significantly greater in GQDs than conventional semiconductor QDs in infrared spectrum (2–6 um) with a resonant TPA cross section of up to 10(11 )GM. The TPA peaks are tuned by the GQDs’ size, edge and electron relaxation rate. Nature Publishing Group 2016-09-15 /pmc/articles/PMC5024087/ /pubmed/27629800 http://dx.doi.org/10.1038/srep33260 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Feng, Xiaobo
Li, Zhisong
Li, Xin
Liu, Yingkai
Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region
title Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region
title_full Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region
title_fullStr Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region
title_full_unstemmed Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region
title_short Giant Two-photon Absorption in Circular Graphene Quantum Dots in Infrared Region
title_sort giant two-photon absorption in circular graphene quantum dots in infrared region
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5024087/
https://www.ncbi.nlm.nih.gov/pubmed/27629800
http://dx.doi.org/10.1038/srep33260
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AT lizhisong gianttwophotonabsorptionincirculargraphenequantumdotsininfraredregion
AT lixin gianttwophotonabsorptionincirculargraphenequantumdotsininfraredregion
AT liuyingkai gianttwophotonabsorptionincirculargraphenequantumdotsininfraredregion

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