Theoretical analysis of micro-structural antireflective grating with hydrophobicity

A 3D contour of sub-wavelength structure was designed and analyzed, to decrease the light lose due to the reflection on the surface, and to keep the self-cleaning for the devices used outside with a long service time. Comparing with the ordinary antireflective structure, it has obvious advantages of lower reflectivity, wider suitable spectral region, and hydrophobicity, etc. The research result shows that if generating a relief structure with equal space/line on the substrate surface, the hydrophilic substrate will be more hydrophilic and the same with hydrophobic substrate. Furthermore, the surface wettability could be controlled by changing patterns' duty ratio.