Abstract

Porous nickel–phosphorus (NiP) black surfaces exhibit excellent low reflectance in the visible and near-IR regions. Through use of a model of the surface morphology and composition, the reflectance was numerically simulated by a three-dimensional finite-difference time-domain method to determine the origin of the low reflectance. In agreement with experimental results, the simulations showed a spectrally flat, quite low reflectance of $<0.1\%$ over the entire visible–near-IR region under certain conditions. The reflectance depended strongly on the thickness of the black nickel oxide layer and the aspect ratio of the three-dimensional surface morphology. A method of validating the reflectance of porous NiP black surfaces is suggested.

© 2012 Optical Society of America

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