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Updated: Jun 18, 2026
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Published on: April 15, 2013
Ultrafast switching time and third order nonlinear coefficients of microwave treated single walled carbon nanotube
N Kamaraju1, Sunil Kumar, B Karthikeyan
1Department of Physics and Centre for Ultrafast Laser Applications, Indian Institute of Science, Bangalore 560012, India.
Abstract:
Microwave treated water soluble and amide functionalized single walled carbon nanotubes have been investigated using femtosecond degenerate pump-probe and nonlinear transmission experiments. The time resolved differential transmission using 75 femtosecond pulse with the central wavelength of 790 nm shows a bi-exponential ultrafast photo-bleaching with time constants of 160 fs (130 fs) and 920 fs (300 fs) for water soluble (amide functionalized) nanotubes. Open and closed aperture z-scans show saturation absorption and positive (negative) nonlinear refraction for water soluble (amide functionalized) nanotubes. Two photon absorption coefficient, beta0 approximately 250 cm/GW (650 cm/GW) and nonlinear index, gamma approximately 15 cm2/pW (-30 cm2/pW) are obtained from the theoretical fit in the saturation limit to the data for two types of nanotubes.
