Kamaraju, N and Kumar, Sunil and Sood, AK and Guha, Shekhar and Krishnamurthy, Srinivasan and Rao, CNR (2007) Large nonlinear absorption and refraction coefficients of carbon nanotubes estimated from femtosecond z-scan measurements. In: Applied Physics Letters, 91 (25). 251103-1-251103-3.
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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 $\beta_0 \sim 1.4 cm/MW$ and a nonlinear index $\gamma \sim -5.5 \times 10^{-11} cm^2/W$ to fit the data.
Item Type: | Journal Article |
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Publication: | Applied Physics Letters |
Publisher: | American Institute of Physics |
Additional Information: | Copyright of this article belongs to American Institute of Physics. |
Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
Date Deposited: | 08 Aug 2008 |
Last Modified: | 19 Sep 2010 04:48 |
URI: | http://eprints.iisc.ac.in/id/eprint/15508 |
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