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Graphene Terahertz Lasers: Injection versus Optical Pumping

Published online by Cambridge University Press:  12 April 2013

Taiichi Otsuji
Affiliation:
RIEC, Tohoku University, Sendai, 980-8577, JapanJST-CREST, Tokyo, 102-0075, Japan
Akira Satou
Affiliation:
RIEC, Tohoku University, Sendai, 980-8577, JapanJST-CREST, Tokyo, 102-0075, Japan
Maxim Ryzhii
Affiliation:
CNEL, University of Aizu, Aizu Wakamatsu, 965-8580, JapanJST-CREST, Tokyo, 102-0075, Japan
Vladimir Mitin
Affiliation:
Dept. EE, University at Buffalo, SUNY, Buffalo, New York 14260-1920, USA
Victor Ryzhii
Affiliation:
RIEC, Tohoku University, Sendai, 980-8577, JapanJST-CREST, Tokyo, 102-0075, Japan
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Abstract

In this paper we demonstrate that graphene is one of the best materials for new types of terahertz lasers as optical and/or injection pumping of graphene can exhibit negative-dynamic conductivity in the terahertz spectral range. We analyze the formation of nonequilibrium states in optically pumped graphene layers and in forward-biased graphene structures with lateral p-i-n junctions and consider the conditions of population inversion and lasing. The latter provides a significant advantage of the injection pumping in realization of graphene terahertz lasers. We benchmark graphene as a prospective material for injection-type terahertz lasers.

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Copyright
Copyright © Materials Research Society 2013

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