Ultrafast absorptive and refractive nonlinearities in multiwalled carbon nanotube films

Elim, H. I.; Ji, W.; Ma, G. H.; Lim, K. Y.; Sow, C. H.; Huan, C. H. A.
September 2004
Applied Physics Letters;9/6/2004, Vol. 85 Issue 10, p1799
Academic Journal
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 multiwalled 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/cm2. The magnitude of the third-order nonlinear susceptibility, χ(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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