Formation of solar absorber surface on nickel with femtosecond laser irradiation
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- Hwang, T.Y., Vorobyev, A.Y. & Guo, C. Appl. Phys. A (2012) 108: 299. doi:10.1007/s00339-012-6909-3
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Through femtosecond (fs) laser pulse irradiation, we produce two-dimensional quasiperiodic arrays of nanostructure-covered conical microstructures (NC-CMs) on Ni. We also find that a significant amount of nickel oxide covers NC-CMs owing to the interaction of fs laser pulses with Ni in ambient air. We show that, by controlling the fluence of laser, the reflectance of the fs laser-treated Ni surface can change dramatically in the infrared but the surface still has a high absorptance at UV and visible wavelengths. Because of this unique spectral reflectance, the fs laser-treated Ni surface is well suited for use as a solar absorber surface.