100
M. Zhong and P. Fan
Fig. 2.26 Ultrafast laser fabricated black metal surfaces and their reflection spectra: a “Black” Al,
b “Black” Ti, c “Black” Steel. Reproduced from [60] with permission from Chinese Laser Press
surface reflection is still at an approximately equal level at different wavelengths,
with the reflectance curve remaining a steady line within the whole studied spectrum.
Further, after the growth of oxide nanowires, the hemispherical reflectance declines
abruptly over the whole studied wavelength range, with some deep reflectance valleys
emerging. Particularly, at the wavelengths around 15–16 µm, the surface reflectance
drops to a minimum value of ~2%, achieving a reduction by a factor ~38 and ~48
with respect to the micro cones without nanowires and the polished Cu surface,
M. Zhong and P. Fan
Fig. 2.26 Ultrafast laser fabricated black metal surfaces and their reflection spectra: a “Black” Al,
b “Black” Ti, c “Black” Steel. Reproduced from [60] with permission from Chinese Laser Press
surface reflection is still at an approximately equal level at different wavelengths,
with the reflectance curve remaining a steady line within the whole studied spectrum.
Further, after the growth of oxide nanowires, the hemispherical reflectance declines
abruptly over the whole studied wavelength range, with some deep reflectance valleys
emerging. Particularly, at the wavelengths around 15–16 µm, the surface reflectance
drops to a minimum value of ~2%, achieving a reduction by a factor ~38 and ~48
with respect to the micro cones without nanowires and the polished Cu surface,