Abstract
We have investigated the highly nonlinear terahertz (THz) light-matter interaction in single-walled carbon nanotubes (SWNTs). The high-peak THz electric-field (∼0.7 MV/cm) and the low effective mass of carriers result in their ponderomotive energy exceeding the bandgap energy of semiconducting SWNTs. Under such an intense THz pulse irradiation, the interband excitation that results in the generation of excitons occurs, although the THz photon energy (∼4 meV) is much smaller than the gap energy of SWNTs (∼1 eV). The ultrafast dynamics of this exciton generation process is investigated by THz pump and optical probe spectroscopy. The exciton generation mechanism is described by impact excitation process induced by the strong THz E-field. Such intense THz pulse excitation provides a powerful tool to study nonlinear terahertz optics in non-perturbative regime as well as nonlinear transport phenomena in solids with ultrafast temporal resolution.
| Original language | English |
|---|---|
| Pages (from-to) | 1528-1538 |
| Number of pages | 11 |
| Journal | Optics Express |
| Volume | 19 |
| Issue number | 2 |
| Publication status | Published - 2011 Jan 17 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Intense terahertz pulse induced exciton generation in carbon nanotubes. / Watanabe, Shinichi; Minami, Nobutsugu; Shimano, Ryo.
In: Optics Express, Vol. 19, No. 2, 17.01.2011, p. 1528-1538.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Intense terahertz pulse induced exciton generation in carbon nanotubes
AU - Watanabe, Shinichi
AU - Minami, Nobutsugu
AU - Shimano, Ryo
PY - 2011/1/17
Y1 - 2011/1/17
N2 - We have investigated the highly nonlinear terahertz (THz) light-matter interaction in single-walled carbon nanotubes (SWNTs). The high-peak THz electric-field (∼0.7 MV/cm) and the low effective mass of carriers result in their ponderomotive energy exceeding the bandgap energy of semiconducting SWNTs. Under such an intense THz pulse irradiation, the interband excitation that results in the generation of excitons occurs, although the THz photon energy (∼4 meV) is much smaller than the gap energy of SWNTs (∼1 eV). The ultrafast dynamics of this exciton generation process is investigated by THz pump and optical probe spectroscopy. The exciton generation mechanism is described by impact excitation process induced by the strong THz E-field. Such intense THz pulse excitation provides a powerful tool to study nonlinear terahertz optics in non-perturbative regime as well as nonlinear transport phenomena in solids with ultrafast temporal resolution.
AB - We have investigated the highly nonlinear terahertz (THz) light-matter interaction in single-walled carbon nanotubes (SWNTs). The high-peak THz electric-field (∼0.7 MV/cm) and the low effective mass of carriers result in their ponderomotive energy exceeding the bandgap energy of semiconducting SWNTs. Under such an intense THz pulse irradiation, the interband excitation that results in the generation of excitons occurs, although the THz photon energy (∼4 meV) is much smaller than the gap energy of SWNTs (∼1 eV). The ultrafast dynamics of this exciton generation process is investigated by THz pump and optical probe spectroscopy. The exciton generation mechanism is described by impact excitation process induced by the strong THz E-field. Such intense THz pulse excitation provides a powerful tool to study nonlinear terahertz optics in non-perturbative regime as well as nonlinear transport phenomena in solids with ultrafast temporal resolution.
UR - http://www.scopus.com/inward/record.url?scp=78751493655&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78751493655&partnerID=8YFLogxK
M3 - Article
VL - 19
SP - 1528
EP - 1538
JO - Optics Express
JF - Optics Express
SN - 1094-4087
IS - 2
ER -