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Terahertz light amplification by stimulated emission of radiation in optically pumped graphene

Published online by Cambridge University Press:  07 June 2012

Taiichi Otsuji ,
Stephane Boubanga Tombet ,
Akira Satou ,
S. Chan  and
Victor Ryzhii
Taiichi Otsuji
Affiliation:
RIEC, Tohoku University, Sendai, 980-8577, Japan JST-CREST, Tokyo, 102-0075, Japan
Stephane Boubanga Tombet
Affiliation:
RIEC, Tohoku University, Sendai, 980-8577, Japan
Akira Satou
Affiliation:
RIEC, Tohoku University, Sendai, 980-8577, Japan JST-CREST, Tokyo, 102-0075, Japan
S. Chan
Affiliation:
NSF-PIRE Nano-Japan, University of Pennsylvania, Philadelphia, PA 19104, USA
Victor Ryzhii
Affiliation:
RIEC, Tohoku University, Sendai, 980-8577, Japan JST-CREST, Tokyo, 102-0075, Japan
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Abstract

Recent advances in terahertz light amplification by stimulated emission of radiation in optically pumped graphene are reviewed. We present, within a picosecond time scale, fast relaxation and relatively slow recombination dynamics of photogenerated electrons and holes in an exfoliated graphene under infrared pulse excitation. We conduct time-domain spectroscopic studies using an optical pump and terahertz probe with an optical probe technique and show that graphene sheet amplifies an incoming terahertz field. The graphene emission spectral dependency on laser pumping intensity shows a threshold-like behavior, testifying to the occurrence of the negative conductivity and the population inversion. The emission spectra clearly narrow at a longer terahertz probe delay time, giving an evidence that the quasi-Fermi energy moves closer to the equilibrium at this longer terahertz probe delay time.

Keywords

laserelectron-phonon interactionselectronic structure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1451: Symposium DD/EE – Nanocarbon Materials and Devices , 2012 , pp. 169 - 177
Copyright
Copyright © Materials Research Society 2012

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References

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