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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 6 — Mar. 15, 2010
  • pp: 6347–6359

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

Hua Bao, Xiulin Ruan, and Timothy S. Fisher  »View Author Affiliations

Optics Express, Vol. 18, Issue 6, pp. 6347-6359 (2010)

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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.

© 2010 Optical Society of America

OCIS Codes
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Thin Films

Original Manuscript: January 15, 2010
Revised Manuscript: February 23, 2010
Manuscript Accepted: March 3, 2010
Published: March 12, 2010

Virtual Issues
Focus Issue: Solar Concentrators (2010) Optics Express

Hua Bao, Xiulin Ruan, and Timothy S. Fisher, "Optical properties of ordered vertical arrays of multi-walled carbon nanotubes from FDTD simulations," Opt. Express 18, 6347-6359 (2010)

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