Intense terahertz pulse-induced nonlinear responses in carbon nanotubes

Ryo Shimano, Shinichi Watanabe, Ryusuke Matsunaga

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

By using intense terahertz(THz) monocycle pulses, nonlinear light-matter interaction in aligned semiconducting single-walled carbon nanotubes(SWNTs) embedded in a polymer film was investigated. THz electric-field-induced ultrafast Stark effect of onedimensional excitons in SWNTs was observed at room temperature, suggesting the potential functionality of SWNTs for high speed electro-optic devices operating at telecom wavelength with a THz bandwidth. When the peak electric field amplitude exceeds 200 kV/cm, the generation of excitons by the THz pump becomes prominent. The mechanism is described by the above-gap excitation of electrons and holes in SWNTs due to the impact excitation process induced by the intense THz electric field.

Original languageEnglish
Pages (from-to)861-869
Number of pages9
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Volume33
Issue number8
DOIs
Publication statusPublished - 2012 Aug 1

Keywords

  • Exciton
  • Impact excitation
  • Single-walled carbon nanotubes
  • Stark effect
  • Terahertz time-domain spectroscopy
  • Ultrafast

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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