Large nonlinear absorption and refraction coefficients of carbon nanotubes estimated from femtosecond z-scan measurements

Please use this identifier to cite or link to this item: https://libjncir.jncasr.ac.in/xmlui/handle/10572/104

Title:	Large nonlinear absorption and refraction coefficients of carbon nanotubes estimated from femtosecond z-scan measurements
Authors:	Kamaraju, N Kumar, Sunil Sood, A K Guha, Shekhar Krishnamurthy, Srinivasan Rao, C N R
Keywords:	Optical Limiting Behavior Saturable Absorption Suspensions Polymer
Issue Date:	17-Dec-2007
Publisher:	American Institute of Physics
Citation:	Applied Physics Letters 91(25), 251103-1-3 (2007)
Abstract:	Nonlinear transmission of 80 and 140 fs pulsed light with 0.79 mu m wavelength through single walled carbon nanotubes suspended in water containing sodium dodecyl sulfate is studied. Pulse-width independent saturation absorption and negative cubic nonlinearity are observed, respectively, in open and closed aperture z-scan experiments. The theoretical expressions derived to analyze the z-dependent transmission in the saturable limit require two photon absorption coefficient beta(0)similar to 1.4 cm/MW and a nonlinear index gamma similar to-5.5x10(-11) cm(2)/W to fit the data. (c) 2007 American Institute of Physics.
URI:	https://libjncir.jncasr.ac.in/xmlui/10572/104
Other Identifiers:	0003-6951
Appears in Collections:	Research Papers (Prof. C.N.R. Rao)

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