Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 33, Issue 8, Pages 861-869Publisher
SPRINGER
DOI: 10.1007/s10762-012-9914-x
Keywords
Terahertz time-domain spectroscopy; Exciton; Single-walled carbon nanotubes; Ultrafast; Stark effect; Impact excitation
Funding
- MEXT, Japan
- [22244036]
- [20110005]
- Grants-in-Aid for Scientific Research [20110005] Funding Source: KAKEN
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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.
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