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Paper Abstract and Keywords
Presentation 2012-12-18 10:05
Operation temperature performance improvement by utilizing high Al composition AlGaAs in THz QCLs
Tsung-Tse Lin, Hideki Hirayama (RIKEN) ED2012-103 Link to ES Tech. Rep. Archives: ED2012-103
Abstract (in Japanese) (See Japanese page) 
(in English) Terahertz quantum cascade lasers (THz QCLs) are unipolar intersubband transition semiconductor THz source with narrow linewidth and high output power. They have been earnest to operate near room temperature in order to realize compact size THz applications without cooling system. Current limited maximum operation temperature (Tmax) 199.5 K is reported by a state-of-the-art longitudinal optical (LO) phonon depopulation scheme GaAs/Al0.15Ga0.85As structure. Here we propose the operation temperature performance improvement by utilizing high Al composition AlGaAs in THz QCLs and succsefully increase the Tmax of a 4-well resonant tunneling (RT) LO phonon scheme THz QCLs about 10 K.
The deep well potential and increase total LO phonon energy will increase the design freedom and improve the thermal performances.
It have the advantage of (1) Reduce Jth at high temperature operation region and increase device characteristic temperature (T0).
Because higher LO phonon energy is expected to reduce the non-radiative leakage via LO-phonon scattering between two lasing levels.
(2) Reduce thermal backfilling from ground level.
Both are expected to reduce Jth at higher temperature.
The high Al composition AlGaAs structure is one of the suitable designs for approaching the high temperature operation THz QCLs.
Keyword (in Japanese) (See Japanese page) 
(in English) Terahertz / Quantum Cascade Laser / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 364, ED2012-103, pp. 57-61, Dec. 2012.
Paper # ED2012-103 
Date of Issue 2012-12-10 (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 ED2012-103 Link to ES Tech. Rep. Archives: ED2012-103

Conference Information
Committee ED  
Conference Date 2012-12-17 - 2012-12-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Millimeter wave / Terahertz devices and systems 
Paper Information
Registration To ED 
Conference Code 2012-12-ED 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Operation temperature performance improvement by utilizing high Al composition AlGaAs in THz QCLs 
Sub Title (in English)  
Keyword(1) Terahertz  
Keyword(2) Quantum Cascade Laser  
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1st Author's Name Tsung-Tse Lin  
1st Author's Affiliation RIKEN (RIKEN)
2nd Author's Name Hideki Hirayama  
2nd Author's Affiliation RIKEN (RIKEN)
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Date Time 2012-12-18 10:05:00 
Presentation Time 25 minutes 
Registration for ED 
Paper # ED2012-103 
Volume (vol) vol.112 
Number (no) no.364 
Page pp.57-61 
#Pages
Date of Issue 2012-12-10 (ED) 


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