Giant terahertz gain by excitation of surface plasmon polarities in optically pumped graphene

Taiichi Otsuji, Takayuki Watanabe, Stephane Albon Boubanga Tombet, Akira Satou, Alexander A. Dubinov, Vladimir Y. Aleshkin, Vladimir Mitin, Victor Ryzhii

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

Abstract

Interband photoexcitation in monolayer graphene can produce a weak gain in the terahertz range by only up to 2.3%, but exciting the surface plasmon polaritons mediates the light-matter interaction, resulting in a giant terahertz gain. Nonlinear carrier relaxation/recombination dynamics and resultant stimulated terahertz (THz) photon emission with excitation of surface plasmon polaritons (SPPs) in photoexcited monolayer graphene has been experimentally studied using optical-pump/THz-probe and optical-probe measurement. We observed the spatial distribution of the THz probe pulse intensities under linear polarization of optical pump and THz probe pulses. It was clearly observed that intense THz probe pulse was detected only at the area where the incoming THz probe pulse takes a TM mode being capable of exciting the SPPs. The observed gain factor is in fair agreement with theoretical calculations.

Original languageEnglish
Title of host publicationTerahertz Physics, Devices, and Systems VIII
Subtitle of host publicationAdvanced Applications in Industry and Defense
PublisherSPIE
ISBN (Print)9781628410396
DOIs
Publication statusPublished - 2014 Jan 1
EventTerahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense - Baltimore, MD, United States
Duration: 2014 May 52014 May 6

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9102
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherTerahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense
CountryUnited States
CityBaltimore, MD
Period14/5/514/5/6

Keywords

  • Gain
  • Graphene
  • Laser
  • Plasmon
  • Polaritons
  • Terahertz

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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