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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationNanocarbon Materials and Devices
Pages169-177
Number of pages9
DOIs
Publication statusPublished - 2013 Jan 1
Event2012 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2012 Apr 92012 Apr 13

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1451
ISSN (Print)0272-9172

Other

Other2012 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period12/4/912/4/13

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Terahertz light amplification by stimulated emission of radiation in optically pumped graphene'. Together they form a unique fingerprint.

  • Cite this

    Otsuji, T., Boubanga Tombet, S. A., Satou, A., Chan, S., & Ryzhii, V. (2013). Terahertz light amplification by stimulated emission of radiation in optically pumped graphene. In Nanocarbon Materials and Devices (pp. 169-177). (Materials Research Society Symposium Proceedings; Vol. 1451). https://doi.org/10.1557/opl.2012.1108