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| Presentation | 2019-12-23 14:55 Observation of Broadband THz Emission from Near-IR Laser-Pumped Multilayer Graphene Takahiro Komiyama, Takayuki Watanabe (Tohoku Univ.), Sergey Morozov, Mikhail Fadeev, Vladimir Utochkin (IPM-RAS), Hirokazu Fukidome, Akira Satou, Taiichi Otsuji (Tohoku Univ.)  ED2019-80 Link to ES Tech. Rep. Archives: ED2019-80 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | We experimentally observe THz emission from non-Bernal-stacked multilayer graphene thermally decomposed on a C-face SiC substrate by using Fourier transform far-infrared spectroscopy under pulsed near- and far-IR optical pumping having a wavelength of 2.3 μm and 10.6 μm, respectively. When the sample was pumped by the 2.3-μm far-IR laser a broadband emission ranging from 15 to 45 THz was observed correspondingly to the negative optical conductivity spectra originated by the pumping. When the sample was pumped by the 10.6-μm pulsed CO2 laser, on the contrary, no distinctive emission was observed. Theoretically the longer-wavelength far-IR pumping should help suppress carrier heating and resultant Auger processes, promoting the carrier population inversion thus increase the THz gain. The results suggest that the sample holds rather strong unintentional doping which may cause Pauli blocking to the 10.6-μm pumping photons. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Graphene / Terahertz / Optical Pumping / Population Inversion / Negative Conductivity / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 119, no. 353, ED2019-80, pp. 17-20, Dec. 2019. | |
| Paper # | ED2019-80 | |
| Date of Issue | 2019-12-16 (ED) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | ED2019-80 Link to ES Tech. Rep. Archives: ED2019-80 |
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| Conference Information | |
| Committee | ED THz |
| Conference Date | 2019-12-23 - 2019-12-24 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | ED |
| Conference Code | 2019-12-ED-THz |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Observation of Broadband THz Emission from Near-IR Laser-Pumped Multilayer Graphene |
| Sub Title (in English) | |
| Keyword(1) | Graphene |
| Keyword(2) | Terahertz |
| Keyword(3) | Optical Pumping |
| Keyword(4) | Population Inversion |
| Keyword(5) | Negative Conductivity |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Takahiro Komiyama |
| 1st Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 2nd Author's Name | Takayuki Watanabe |
| 2nd Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 3rd Author's Name | Sergey Morozov |
| 3rd Author's Affiliation | Institute for Physics of Microstructures RAS (IPM-RAS) |
| 4th Author's Name | Mikhail Fadeev |
| 4th Author's Affiliation | Institute for Physics of Microstructures RAS (IPM-RAS) |
| 5th Author's Name | Vladimir Utochkin |
| 5th Author's Affiliation | Institute for Physics of Microstructures RAS (IPM-RAS) |
| 6th Author's Name | Hirokazu Fukidome |
| 6th Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 7th Author's Name | Akira Satou |
| 7th Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 8th Author's Name | Taiichi Otsuji |
| 8th Author's Affiliation | Tohoku University (Tohoku Univ.) |
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| Speaker | Author-1 |
| Date Time | 2019-12-23 14:55:00 |
| Presentation Time | 25 minutes |
| Registration for | ED |
| Paper # | ED2019-80 |
| Volume (vol) | vol.119 |
| Number (no) | no.353 |
| Page | pp.17-20 |
| #Pages | 4 |
| Date of Issue | 2019-12-16 (ED) |
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