| Presentation | 2009-11-30 Observation of Coherent THz Emission in Optically Pumped Epitaxial Graphene Heterostructures Hiromi KARASAWA, Takayuki WATANABE, Tsuneyoshi KOMORI, Maki SUEMITSU, Victor Ryzhii, Taiichi OTSUJI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Graphene is a single-layer carbon-atomic honeycomb lattice crystal. Electrons and holes in graphene hold a linear dispersion relation with zero bandgap, resulting in a peculiar feature of negative-dynamic conductivity by optical pumping in the terahertz (THz) range at room temperature. Owing to this feature, we think that the population inversion and stimulated emission in graphene can be achieved. In this paper, we show the observation of coherent THz emission using an optical-pump/THz-probe technique based on the electrooptic sampling. This phenomenon is interpreted as an amplified stimulated THz emission, which will lead to a new type of THz laser. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | negative-dynamic conductivity / population inversion / stimulated emission / GOS / coherent |
| Paper # | ED2009-169 |
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| Conference Information | |
| Committee | ED |
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| Conference Date | 2009/11/22(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Electron Devices (ED) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Observation of Coherent THz Emission in Optically Pumped Epitaxial Graphene Heterostructures |
| Sub Title (in English) | |
| Keyword(1) | negative-dynamic conductivity |
| Keyword(2) | population inversion |
| Keyword(3) | stimulated emission |
| Keyword(4) | GOS |
| Keyword(5) | coherent |
| 1st Author's Name | Hiromi KARASAWA |
| 1st Author's Affiliation | RIEC, Tohoku University() |
| 2nd Author's Name | Takayuki WATANABE |
| 2nd Author's Affiliation | RIEC, Tohoku University |
| 3rd Author's Name | Tsuneyoshi KOMORI |
| 3rd Author's Affiliation | RIEC, Tohoku University |
| 4th Author's Name | Maki SUEMITSU |
| 4th Author's Affiliation | RIEC, Tohoku University:JST-CREST |
| 5th Author's Name | Victor Ryzhii |
| 5th Author's Affiliation | Depertment of Computer Science and Engineering, University of Aizu:JST-CREST |
| 6th Author's Name | Taiichi OTSUJI |
| 6th Author's Affiliation | RIEC, Tohoku University:JST-CREST |
| Date | 2009-11-30 |
| Paper # | ED2009-169 |
| Volume (vol) | vol.109 |
| Number (no) | 313 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |