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

Taiichi Otsuji, Stephane Boubanga Tombet, Akira Satou, S. Chan, Victor Ryzhii

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルNanocarbon Materials and Devices
ページ169-177
ページ数9
DOI
出版ステータスPublished - 2013
イベント2012 MRS Spring Meeting - San Francisco, CA, United States
継続期間: 2012 4月 92012 4月 13

出版物シリーズ

名前Materials Research Society Symposium Proceedings
1451
ISSN(印刷版)0272-9172

Other

Other2012 MRS Spring Meeting
国/地域United States
CitySan Francisco, CA
Period12/4/912/4/13

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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