Ultrafast absorptive and refractive nonlinearities in multi-walled carbon nanotube film

Details Ultrafast absorptive and refractive nonlinearities in multi-walled carbon nanotube film Ultrafast absorptive and refractive nonlinearities in multi-walled carbon nanotube film

2003-11-11

arxiv.org/abs/cond-mat/0311236v1

Appl Phys Lett 85 (10), pp. 1799-1801 (2004)

Physics

Condensed Matter

Materials Science

12 pages, 4 figures, submitted to Appl. Phys. Lett. (2003)

Scientific paper

10.1063/1.1786371

By using femtosecond laser pulses at a wavelength range from 720 to 780 nm, we have observed absorptive and refractive nonlinearities in a film of multi-walled carbon nanotubes grown mainly along the direction perpendicular to the surface of quartz substrate. The Z-scans show that both absorptive and refractive nonlinearities are of negative and cubic nature in the laser irradiance range from a few to 300 GW/cm^2. The magnitude of the third-order nonlinear susceptibility,chi-(3), is of an order of 10^-11 esu. The degenerate pump-probe measurement reveals a relaxation time of 2 ps.

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