Highly specular carbon nanotube absorbers

X. J. Wang, L. P. Wang, O. S. Adewuyi, B. A. Cola, Z. M. Zhang

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Abstract

Specular black materials have important applications, such as in absolute cryogenic radiometers, space-borne spectroradiometers, and some energy conversion devices. While vertically aligned carbon nanotubes (VACNT) can have close-to-unity absorptance, so far the reported reflection has been essentially diffuse. This letter describes a highly specular black absorber made of VACNT. Both the bidirectional reflectance distribution function and specular reflectance were measured at the wavelength λ=635 nm using a laser scatterometer. The ordinary and extraordinary optical constants were obtained by fitting the specular reflectance, calculated from modified reflectance formulae for light incident from air to a uniaxial medium, considering surface roughness. Furthermore, the absorptance at λ=635 nm was shown to be 0.994±0.002, based on the measured directional-hemispherical reflectance.

Original languageEnglish (US)
Article number163116
JournalApplied Physics Letters
Volume97
Issue number16
DOIs
StatePublished - Oct 18 2010

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Wang, X. J., Wang, L. P., Adewuyi, O. S., Cola, B. A., & Zhang, Z. M. (2010). Highly specular carbon nanotube absorbers. Applied Physics Letters, 97(16), [163116]. https://doi.org/10.1063/1.3502597