Experimental observation of an extremely dark material made by a low-density nanotube array.

@article{Yang2008ExperimentalOO,
  title={Experimental observation of an extremely dark material made by a low-density nanotube array.},
  author={Zu-Po Yang and Lijie Ci and James A. Bur and Shawn-Yu Lin and Pulickel M. Ajayan},
  journal={Nano letters},
  year={2008},
  volume={8 2},
  pages={
          446-51
        }
}
An ideal black material absorbs light perfectly at all angles and over all wavelengths. Here, we show that low-density vertically aligned carbon nanotube arrays can be engineered to have an extremely low index of refraction, as predicted recently by theory [Garcia-Vidal, F. J.; Pitarke, J. M.; Pendry, J. B. Phys. Rev. Lett. 1997, 78, 4289-4292] and, combined with the nanoscale surface roughness of the arrays, can produce a near-perfect optical absorption material. An ultralow diffused… 

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