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Paper Abstract and Keywords
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
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
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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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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)  
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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  
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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Date Time 2019-12-23 14:55:00 
Presentation Time 25 
Registration for ED 
Paper # IEICE-ED2019-80 
Volume (vol) IEICE-119 
Number (no) no.353 
Page pp.17-20 
#Pages IEICE-4 
Date of Issue IEICE-ED-2019-12-16 

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