Observation of carrier relaxation and recombination dynamics in optically pumped epitaxial graphene heterostructures using terahertz emission spectroscopy

Author

Karasawa, H. ; Komori, T. ; Watanabe, T. ; Suemitsu, M. ; Ryzhii, V. ; Otsuji, T.

Author_Institution

RIEC, Tohoku Univ., Sendai, Japan

fYear

2009

fDate

14-19 June 2009

Firstpage

1

Lastpage

1

Abstract

The authors experimentally observed the fast relaxation and relatively slow recombination dynamics of photogenerated electrons/holes in an epitaxial graphene heterostructure. The result well supports the occurrence of negative dynamic conductivity leading to the population inversion to making a new type of THz lasers.

Keywords

carrier relaxation time; electron-hole recombination; optical pumping; organic semiconductors; submillimetre wave lasers; THz lasers; carrier relaxation; epitaxial graphene heterostructures; negative dynamic conductivity; optical pumping; photogenerated electrons/holes; population inversion; recombination dynamics; terahertz emission spectroscopy; Charge carrier processes; Conductivity; Electron optics; Optical films; Optical pumping; Phonons; Spectroscopy; Spontaneous emission; Stimulated emission; Surface emitting lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on

Conference_Location

Munich

Print_ISBN

978-1-4244-4079-5

Electronic_ISBN

978-1-4244-4080-1

Type

conf

DOI

10.1109/CLEOE-EQEC.2009.5196405

Filename

5196405