Intense Terahertz Pulse-Induced Nonlinear Responses in Carbon Nanotubes |
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| Authors: | Ryo Shimano Shinichi Watanabe Ryusuke Matsunaga |
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| Affiliation: | (1) Department of Physics, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan;(2) Present address: Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama Kanagawa, 223-8522, Japan |
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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
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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