Observation of amplified stimulated terahertz emission from optically pumped heteroepitaxial graphene-on-silicon materials

Hiromi Karasawa, Tsuneyoshi Komori, Takayuki Watanabe, Akira Satou, Hirokazu Fukidome, Maki Suemitsu, Victor Ryzhii, Taiichi Otsuji

研究成果: Article査読

47 被引用数 (Scopus)

抄録

We experimentally observed the fast relaxation and relatively slow recombination dynamics of photogenerated electrons/holes in a heteroepitaxial graphene-on-Si material under pumping with a 1550-nm, 80-fs pulsed fiber laser and probing with the corresponding terahertz beam generated by and synchronized with the pumping laser. The time-resolved electric-nearfield intensity originating from the coherent terahertz photon emission is electrooptically sampled in total-reflection geometry. The Fourier spectrum fairly agrees the product of the negative dynamic conductivity and the expected THz photon spectrum reflecting the pumping photon spectrum. This phenomenon is interpreted as an amplified stimulated terahertz emission.

本文言語English
ページ(範囲)655-665
ページ数11
ジャーナルJournal of Infrared, Millimeter, and Terahertz Waves
32
5
DOI
出版ステータスPublished - 2011 5

ASJC Scopus subject areas

  • 放射線
  • 器械工学
  • 凝縮系物理学
  • 電子工学および電気工学

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