104
M. Zhong and P. Fan
Fig. 2.30 Microstructure characterizations of modified Cu SMNS with a periodicity of 30 µm (a,
c) and 50 µm (b, d). All scale bars are equal to 20 µm. Reproduced from [61] with permission from
the American Chemical Society
Fig. 2.31 Broadband near-unity antireflection of the modified SMNS in the MIR spectrum, a hemispherical reflectance of Cu SMNS with periodicity of 30 µm (magenta lines) and 50 µm (olive lines)
b average reflectance in different wavelength ranges of Cu SMNS with nanowires with a periodicity
of 30 µm. Reproduced from [61] with permission from the American Chemical Society
the reflection spectra of both the denser micro cones and the micro petals have reached
obviously lower levels than those in Fig. 2.28. In particular, the reflectance from both
structures with nanowires decreases to below 10% in a broad spectrum. The denser
micro cones and the micro petals achieve enhanced antireflection performances
through a similar physical mechanism. The smaller spacing between the adjacent
cones in the denser micro cone arrays and the unique morphology of the micro petals