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Graphene based All-Optical Spatial Terahertz Modulator
We demonstrate an all-optical terahertz modulator based on single-layer graphene on germanium (GOG), which can be driven by a 1.55 μm CW laser with a low-level photodoping power. Both the static and dynamic THz transmission modulation experiments were carried out. A spectrally wide-band modulation o...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4261162/ https://www.ncbi.nlm.nih.gov/pubmed/25491194 http://dx.doi.org/10.1038/srep07409 |
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author | Wen, Qi-Ye Tian, Wei Mao, Qi Chen, Zhi Liu, Wei-Wei Yang, Qing-Hui Sanderson, Matthew Zhang, Huai-Wu |
author_facet | Wen, Qi-Ye Tian, Wei Mao, Qi Chen, Zhi Liu, Wei-Wei Yang, Qing-Hui Sanderson, Matthew Zhang, Huai-Wu |
author_sort | Wen, Qi-Ye |
collection | PubMed |
description | We demonstrate an all-optical terahertz modulator based on single-layer graphene on germanium (GOG), which can be driven by a 1.55 μm CW laser with a low-level photodoping power. Both the static and dynamic THz transmission modulation experiments were carried out. A spectrally wide-band modulation of the THz transmission is obtained in a frequency range from 0.25 to 1 THz, and a modulation depth of 94% can be achieved if proper pump power is applied. The modulation speed of the modulator was measured to be ~200 KHz using a 340 GHz carrier. A theoretical model is proposed for the modulator and the calculation results indicate that the enhanced THz modulation is mainly due to the third order nonlinear effect in the optical conductivity of the graphene monolayer. |
format | Online Article Text |
id | pubmed-4261162 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-42611622014-12-15 Graphene based All-Optical Spatial Terahertz Modulator Wen, Qi-Ye Tian, Wei Mao, Qi Chen, Zhi Liu, Wei-Wei Yang, Qing-Hui Sanderson, Matthew Zhang, Huai-Wu Sci Rep Article We demonstrate an all-optical terahertz modulator based on single-layer graphene on germanium (GOG), which can be driven by a 1.55 μm CW laser with a low-level photodoping power. Both the static and dynamic THz transmission modulation experiments were carried out. A spectrally wide-band modulation of the THz transmission is obtained in a frequency range from 0.25 to 1 THz, and a modulation depth of 94% can be achieved if proper pump power is applied. The modulation speed of the modulator was measured to be ~200 KHz using a 340 GHz carrier. A theoretical model is proposed for the modulator and the calculation results indicate that the enhanced THz modulation is mainly due to the third order nonlinear effect in the optical conductivity of the graphene monolayer. Nature Publishing Group 2014-12-10 /pmc/articles/PMC4261162/ /pubmed/25491194 http://dx.doi.org/10.1038/srep07409 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-sa/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 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 in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/ |
spellingShingle | Article Wen, Qi-Ye Tian, Wei Mao, Qi Chen, Zhi Liu, Wei-Wei Yang, Qing-Hui Sanderson, Matthew Zhang, Huai-Wu Graphene based All-Optical Spatial Terahertz Modulator |
title | Graphene based All-Optical Spatial Terahertz Modulator |
title_full | Graphene based All-Optical Spatial Terahertz Modulator |
title_fullStr | Graphene based All-Optical Spatial Terahertz Modulator |
title_full_unstemmed | Graphene based All-Optical Spatial Terahertz Modulator |
title_short | Graphene based All-Optical Spatial Terahertz Modulator |
title_sort | graphene based all-optical spatial terahertz modulator |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4261162/ https://www.ncbi.nlm.nih.gov/pubmed/25491194 http://dx.doi.org/10.1038/srep07409 |
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