Ultrafast Switching Time and Third Order Nonlinear Coefficients of Microwave Treated Single Walled Carbon Nanotube Suspensions

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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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, 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
URI:	http://eprints.iisc.ernet.in/id/eprint/23268

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