Phys. Rev. Lett. 94, 047404 (2005) [4 pages]Large Optical Nonlinearity of Semiconducting Single-Walled Carbon Nanotubes under Resonant ExcitationsReceived 25 March 2004; published 3 February 2005 We measured third-order nonlinear susceptibility (χ(3)) spectra in semiconducting single-walled carbon nanotubes (SWNTs) by the Z-scan method. |Imχ(3)| is remarkably enhanced under resonant excitation to the lowest interband transition, reaching 4.2×10-6 esu and 1.5×10-7 esu in SWNTs grown by the laser ablation and HiPco methods, respectively. A comparison of the transient absorption changes evaluated by degenerate and nondegenerate pump-probe measurements suggests that the resonant enhancement of |Imχ(3)| is dominated by a coherent process rather than by saturation of absorption. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.047404
DOI:
10.1103/PhysRevLett.94.047404
PACS:
78.67.Ch, 42.65.–k, 78.47.+p
See AlsoComment: C.-X. Sheng and Z. V. Vardeny, Comment on “Large Optical Nonlinearity of Semiconducting Single-Walled Carbon Nanotubes under Resonant Excitations”, Phys. Rev. Lett. 96, 019705 (2006). Reply: H. Okamoto, S. Matsumoto, A. Maeda, H. Kishida, Y. Iwasa, and T. Takenobu, Okamoto et al. Reply:, Phys. Rev. Lett. 96, 019706 (2006). |
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