Ultrafast electron dynamics and cubic optical nonlinearity of freestanding thin film of double walled carbon nanotubes

Kamaraju, N. ; Kumar, Sunil ; Karthikeyan, B. ; Moravsky, Alexander ; Loutfy, R. O. ; Sood, A. K. (2008) Ultrafast electron dynamics and cubic optical nonlinearity of freestanding thin film of double walled carbon nanotubes Applied Physics Letters, 93 (9). 091903_1-091903_3. ISSN 0003-6951

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Official URL: http://apl.aip.org/resource/1/applab/v93/i9/p09190...

Related URL: http://dx.doi.org/10.1063/1.2977463

Abstract

Ultrafast degenerate pump-probe experiments performed on a freestanding film of double walled carbon nanotubes near the first metallic transition energy of outer tube show ultrafast (97 fs) photobleaching followed by a photoinduced absorption with a slow relaxation of 1.8 ps. Femtosecond closed and open aperture z-scan experiments carried out at the same excitation energy show saturation absorption and negative cubic nonlinearity. From these measurements, real and imaginary part of the third order nonlinear susceptibility are estimated to be Re(χ(3)) ~−2.2×10−9esu and Im(χ(3)) ~4.5×10−11esu.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Carbon Nanotubes; High-speed Optical Techniques; Nonlinear Optical Susceptibility; Optical Saturable Absorption; Thin Films
ID Code:79891
Deposited On:30 Jan 2012 05:04
Last Modified:18 May 2016 22:05

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