TY - JOUR
T1 - Intense terahertz pulse-induced nonlinear responses in carbon nanotubes
AU - Shimano, Ryo
AU - Watanabe, Shinichi
AU - Matsunaga, Ryusuke
N1 - Funding Information:
We acknowledge Dr. N. Minami for fabricating the stretched-aligned SWNTs/polymer composite films. This work was partially supported by Grants-in-Aid for Scientific Research (No.22244036, 20110005) and Photon Frontier Network Program from MEXT, Japan.
PY - 2012/8
Y1 - 2012/8
N2 - 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.
AB - 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.
KW - Exciton
KW - Impact excitation
KW - Single-walled carbon nanotubes
KW - Stark effect
KW - Terahertz time-domain spectroscopy
KW - Ultrafast
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U2 - 10.1007/s10762-012-9914-x
DO - 10.1007/s10762-012-9914-x
M3 - Article
AN - SCOPUS:84863719940
VL - 33
SP - 861
EP - 869
JO - Journal of Infrared, Millimeter, and Terahertz Waves
JF - Journal of Infrared, Millimeter, and Terahertz Waves
SN - 1866-6892
IS - 8
ER -