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Terahertz transmission ellipsometry of vertically aligned multi-walled carbon nanotubes

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  • We demonstrate time-resolved terahertz transmission ellipsometry of vertically aligned multi-walled carbon nanotubes. The angle-resolved transmission measurements reveal anisotropic characteristics of the terahertz electrodynamics in multi-walled carbon nanotubes. The anisotropy is, however, unexpectedly weak: the ratio of the tube-axis conductivity to the transverse conductivity, sigma[subscript z]/sigma[subscript xy] [similar or equal to] 2.3, is nearly constant over the broad spectral range of 0.4-1.6 THz. The relatively weak anisotropy and the strong transverse electrical conduction indicate that THz fields readily induce electron transport between adjacent shells within multi-walled carbon nanotubes. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4752158]
  • Keywords: Propagation, Films, Conductance
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  • Paul, M., Podolskiy, V., Minot, E., Lee, Y., Kuhta, N., Tomaino, J., . . . Inampudi, S. (2012). Terahertz transmission ellipsometry of vertically aligned multi-walled carbon nanotubes. Applied Physics Letters, 101(11) doi: 10.1063/1.4752158
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  • 101
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  • 11
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  • This work is supported by the National Science Foundation (DMR-1063632 and ECCS-1102183) and the Oregon Nanoscience and Microtechnologies Institute. N.L.R. and K.B.K.T. acknowledge the support of the EC project TECHNOTUBES.
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