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Nonlinear optical properties and phase-relaxation processes in single-walled carbon nanotubes |
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| Authors: | Masao Ichida Yumie Kiyohara Yasumitsu Miyata Hiromichi Kataura |
| Institution: | a Graduate School of Nature Science, Konan University, 8-9-1 Okamoto, Higashinada-ku, Kobe 658-8501, Japan b Quantum Nano-Technology Laboratory, Konan University, 8-9-1 Okamoto, Higashinada-ku, Kobe 658-8501, Japan c National Institute for Information and Communications Technology, 588-2 Iwaoka, Nishi-ku, Kobe 651-2492, Japan d Faculty of Science, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan e Nanotechnology Research Institute, Advanced Industrial Science and Technology, Central 4, 1-1-1 Higashi, Tsukuba 305-8562, Japan |
| Abstract: | We have investigated third-order nonlinear optical properties of bundled and isolated semiconducting single-walled carbon nanotubes (SWNTs) by means of Z-scan method, pump-probe method, and two-beam time-resolved degenerate four-wave mixing (DFWM) method. The figures of merit Im χ(3)/α in both bundled and isolated SWNTs samples were found to be enhanced with increasing tube diameter. The measured Im χ(3)/α value in the bundled SWNTs was an order of magnitude smaller than that in the isolated SWNTs. Both population relaxation time T1 and phase-relaxation time T2 for bundled samples were smaller than those in the isolated samples. These experimental results can be explained by an increase in nonradiative recombination rate and phase-relaxation rate in the bundled sample. The phase-relaxation time T2 is considered to have a significant role in the enhancement of Im χ(3)/α. |
| Keywords: | 78 67 Ch 78 47 nj 71 35 &minus y 71 38 &minus k |
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