Intense terahertz pulse-induced nonlinear responses in carbon nanotubes

Ryo Shimano; Shinichi Watanabe; Ryusuke Matsunaga

doi:10.1007/s10762-012-9914-x

Intense terahertz pulse-induced nonlinear responses in carbon nanotubes

Ryo Shimano, Shinichi Watanabe, Ryusuke Matsunaga

Department of Physics

Research output: Contribution to journal › Article › peer-review

23 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 language	English
Pages (from-to)	861-869
Number of pages	9
Journal	Journal of Infrared, Millimeter, and Terahertz Waves
Volume	33
Issue number	8
DOIs	https://doi.org/10.1007/s10762-012-9914-x
Publication status	Published - 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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Cite this

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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.",

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