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Optical properties of ordered vertical arrays of multi-walled carbon nanotubes from FDTD simulations.

Authors
  • Bao, Hua
  • Ruan, Xiulin
  • Fisher, Timothy S
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Mar 15, 2010
Volume
18
Issue
6
Pages
6347–6359
Identifiers
DOI: 10.1364/OE.18.006347
PMID: 20389658
Source
Medline
License
Unknown

Abstract

A finite-difference time-domain (FDTD) method is used to model thermal radiative properties of vertical arrays of multi-walled carbon nanotubes (MWCNT). Individual CNTs are treated as solid circular cylinders with an effective dielectric tensor. Consistent with experiments, the results confirm that CNT arrays are highly absorptive. Compared with the commonly used Maxwell-Garnett theory, the FDTD calculations generally predict larger reflectance and absorbance, and smaller transmittance, which are attributed to the diffraction and scattering within the cylinder array structure. The effects of volume fraction, tube length, tube distance, and incident angle on radiative properties are investigated systematically. Low volume fraction and long tubes are more favorable to achieve low reflectance and high absorbance. For a fixed volume fraction and finite tube length, larger periodicity results in larger reflectance and absorbance. The angular dependence studies reveal an optimum incident angle at which the reflectance can be minimized. The results also suggest that an even darker material could be achieved by using CNTs with good alignment on the top surface.

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