Optical absorption and energy-loss spectra of aligned carbon nanotubes

Details Optical absorption and energy-loss spectra of aligned carbon nanotubes Optical absorption and energy-loss spectra of aligned carbon nanotubes

2001-05-22

arxiv.org/abs/cond-mat/0105443v1

Eur. Phys. J. B 22, 257 (2001)

Physics

Condensed Matter

Materials Science

7 pages, 12 figures, to appear in Eur. Phys. J. B

Scientific paper

10.1007/PL00011146

Optical-absorption cross-sections and energy-loss spectra of aligned multishell carbon nanotubes are investigated, on the basis of photonic band-structure calculations. A local graphite-like dielectric tensor is assigned to every point of the tubules, and the effective transverse dielectric function of the composite is computed by solving Maxwell's equations in media with tensor-like dielectric functions. A Maxwell-Garnett-like approach appropriate to the case of infinitely long anisotropic tubules is also developed. Our full calculations indicate that the experimentally measured macroscopic dielectric function of carbon nanotube materials is the result of a strong electromagnetic coupling between the tubes. An analysis of the electric-field pattern associated with this coupling is presented, showing that in the close-packed regime the incident radiation excites a very localized tangential surface plasmon.

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