Large nonlinear absorption and refraction coefficients of carbon nanotubes estimated from femtosecond z-scan measurements
- 17 December 2007
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 91 (25)
- https://doi.org/10.1063/1.2825409
Abstract
Nonlinear transmission of 80 and 140 femtosecond pulsed light with $0.79 \mu m$ wavelength through single walled carbon nanotubes suspended in water containing sodium dodecyl sulphate 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 $\beta_0\sim$ $1.4 cm/MW$ and a nonlinear index $\gamma \sim -5.5 \times10^{-11} cm^2/W$ to fit the data.Comment: 10 pages, 2 figures. Accepted and to appear in Applied Physics Letter
Other Versions
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