2010 Fiscal Year Final Research Report
Ultrafast coherent nonlinear optical responses in carbon nanotubes
| Project/Area Number |
20340072
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
OKAMOTO Hiroshi The University of Tokyo, 大学院・新領域創成科学研究科, 教授 (40201991)
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| Project Period (FY) |
2008 – 2010
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| Keywords | カーボンナノチューブ / 非線形光学応答 / レーザー分光 / 光スイッチ / 励起子 |
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| Research Abstract |
In semiconducting carbon nanotubes, optical properties are dominated by large oscillator strength and large binding energy of one-dimensional excitons and, therefore, large third-order optical nonlinearity is expected to be observed. In this study, we have measured coherent nonlinear optical spectra by femtosecond transient absorption spectroscopy. We have found a new kind of coherent nonlinear optical responses originating from exciton-exciton scattering as well as optical Stark effects generally observed in low-dimensional semiconductors under a near-resonant excitation condition.
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