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

Details Ultrafast electron dynamics and cubic optical nonlinearity of free standing thin film of double walled carbon nanotubes Ultrafast electron dynamics and cubic optical nonlinearity of free standing thin film of double walled carbon nanotubes

2008-06-17

arxiv.org/abs/0806.2858v1

Physics

Condensed Matter

Other Condensed Matter

8 pages, 3 figures

Scientific paper

10.1063/1.2977463

Ultrafast degenerate pump-probe experiments performed on a free standing film of double walled carbon nanotubes near the first metallic transition energy of outer tube show ultrafast ($97 fs$) photobleaching followed by a photo-induced 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($\chi^{(3)}) \sim -2.2 \times 10 ^{-9} esu$ and Im($\chi^{(3)}) \sim 1.1 \times 10 ^{-11} esu$.

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