Intense Terahertz Pulse-Induced Nonlinear Responses in Carbon Nanotubes

  • Ryo Shimano
  • Shinichi Watanabe
  • Ryusuke Matsunaga
Article

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 one-dimensional 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.

Keywords

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

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Ryo Shimano
    • 1
  • Shinichi Watanabe
    • 1
    • 2
  • Ryusuke Matsunaga
    • 1
  1. 1.Department of PhysicsThe University of TokyoTokyoJapan
  2. 2.Department of Physics, Faculty of Science and TechnologyKeio UniversityYokohamaJapan

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