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 |
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Pages (from-to) | 861-869 |
Number of pages | 9 |
Journal | Journal of Infrared, Millimeter, and Terahertz Waves |
Volume | 33 |
Issue number | 8 |
DOIs | |
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