Ultrafast absorptive and refractive nonlinearities in multiwalled carbon nanotube films

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 a...

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Bibliographic Details
Published in:Applied physics letters 2004-09, Vol.85 (10), p.1799-1801
Main Authors: Elim, H. I., Ji, W., Ma, G. H., Lim, K. Y., Sow, C. H., Huan, C. H. A.
Format: Article
Language:English
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Summary: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 ∕ cm 2 . 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 .
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1786371