Cola, Baratunde A.

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    Highly specular carbon nanotube absorbers
    (Georgia Institute of Technology, 2010-10) Wang, X. J. ; Wang, L. P. ; Adewuyi, O. S. ; Cola, Baratunde A. ; Zhang, Zhuomin ; Georgia Institute of Technology. Center for Organic Photonics and Electronics ; Georgia Institute of Technology. School of Mechanical Engineering
    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.