Abstract
Nonlinear optical characteristics of single-walled carbon nanotubes (SWCNTs) dispersed in dichlorobenzene and imbedded in polymer were investigated at 800 nm using the time-resolved optical Kerr gate technique. For systematic study of the influence of SWCNT bundling on optical nonlinearities, SWCNT solutions with different concentrations and a series of SWCNT/polymer composites deposited on glass substrates with different concentrations and thicknesses were prepared. The nonlinear response was comparable to the pulse duration of the laser used (∼90 fs) both in SWCNT solutions and SWCNT/polymer composites. Over three orders of magnitude enhancement was observed in the third-order nonlinear susceptibility of SWCNT/polymer composite film compared with that of SWCNT solution. An appreciable reduction of microscopic and macroscopic nonlinearities was observed with increasing SWCNT concentrations due to stronger bundling of SWCNTs.
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Lee, H.W., Yim, J.H., Kiran, A.J. et al. Bundling influence on ultrafast optical nonlinearities of single-walled carbon nanotubes in suspension and composite film. Appl. Phys. B 97, 157–162 (2009). https://doi.org/10.1007/s00340-009-3532-x
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DOI: https://doi.org/10.1007/s00340-009-3532-x