Kamaraju, N and Kumar, Sunil and Karthikeyan, B and Kakade, Bhalchandra and Pillai, Vijayamohanan K and Sood, AK (2009) Ultrafast Switching Time and Third Order Nonlinear Coefficients of Microwave Treated Single Walled Carbon Nanotube Suspensions. In: International Conference on Nanoscience and Technology, FEB 27-29, 2008, Chennai, India, pp. 5550-5554.
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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, beta(0) similar to 250 cm/GW (650 cm/GW) and nonlinear index, gamma similar to 15 cm(2)/pW (-30 cm(2)/pW) are obtained from the theoretical fit in the saturation limit to the data for two types of nanotubes.
|Item Type:||Conference Paper|
|Additional Information:||Copyright of this article belongs to American Scientific Publishers.|
|Keywords:||Ultra-Fast Switching;SWCNT; Nonlinear Optical Coefficients.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||15 Dec 2009 09:44|
|Last Modified:||19 Sep 2010 05:45|
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