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Paper Abstract and Keywords
Presentation 2009-11-30 10:30
Observation of Coherent THz Emission in Optically Pumped Epitaxial Graphene Heterostructures
Hiromi Karasawa, Takayuki Watanabe, Tsuneyoshi Komori (Tohoku Univ.), Maki Suemitsu (Tohoku Univ. /JST-CREST), Victor Ryzhii (Aizu Univ. /JST-CREST), Taiichi Otsuji (Tohoku Univ. /JST-CREST) ED2009-169 Link to ES Tech. Rep. Archives: ED2009-169
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) negative-dynamic conductivity / population inversion / stimulated emission / GOS / coherent / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 313, ED2009-169, pp. 53-58, Nov. 2009.
Paper # ED2009-169 
Date of Issue 2009-11-22 (ED) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 ED2009-169 Link to ES Tech. Rep. Archives: ED2009-169

Conference Information
Committee ED  
Conference Date 2009-11-29 - 2009-11-30 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka Science & Technology Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Millimeter-wave, THz-wave device and system 
Paper Information
Registration To ED 
Conference Code 2009-11-ED 
Language Japanese 
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  
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Keyword(7)  
Keyword(8)  
1st Author's Name Hiromi Karasawa  
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 Tsuneyoshi Komori  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Maki Suemitsu  
4th Author's Affiliation Tohoku University /JST-CREST (Tohoku Univ. /JST-CREST)
5th Author's Name Victor Ryzhii  
5th Author's Affiliation University of Aizu /JST-CREST (Aizu Univ. /JST-CREST)
6th Author's Name Taiichi Otsuji  
6th Author's Affiliation Tohoku University /JST-CREST (Tohoku Univ. /JST-CREST)
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Speaker Author-1 
Date Time 2009-11-30 10:30:00 
Presentation Time 25 minutes 
Registration for ED 
Paper # ED2009-169 
Volume (vol) vol.109 
Number (no) no.313 
Page pp.53-58 
#Pages
Date of Issue 2009-11-22 (ED) 


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