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Applied Physics Letters / Volume 99 / Issue 21 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 99, 211103 (2011); http://dx.doi.org/10.1063/1.3663873 (3 pages)

Low density carbon nanotube forest as an index-matched and near perfect absorption coating

Haofei Shi1, Jong G. Ok2, Hyoung Won Baac1, and L. Jay Guo1

1Center for Nanophotonics and Spintronics, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA
2Center for Nanophotonics and Spintronics, Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA

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(Received 4 October 2011; accepted 4 November 2011; published online 22 November 2011)

We demonstrate broadband, near perfect absorption with a conformal coating of a multi-walled carbon nanotube (CNT) forest on an arbitrarily shaped surface. The complex refractive index of such a CNT forest is retrieved from the measured transmission and reflection spectra using Kramers-Kronig constrained variational analysis, which gives a typical value of neff = 1.04 + 0.01i at visible wavelengths. Therefore, when used as a conformal coating on an object, a thick layer of the CNT forest can provide an excellent impedance match to air and near perfect absorption, preventing any detectable light reflection and scattering from the object.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

carbon nanotubes, conformal coatings, Kramers-Kronig relations, refractive index, visible spectra

PACS

  • 78.67.Ch

    Nanotubes

  • 78.40.Ri

    Fullerenes and related materials

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3663873

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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