Micro nano antireflective and hydrophobic hierarchical structures ZnS by femtosecond laser

Abstract

Antireflective hydrophobic hierarchical structures were fabricated on ZnS with ultralow reflectance by femtosecond laser. By adjusting the scanning interval, laser scanning speed and laser power, different kinds of hierarchical structures were obtained. The hierarchical structures combined the light trapping effect of micro-structures and effective refractive index medium effect of nano structures, greatly reduced the reflectance. At optimal parameters, the reflectance of ZnS with hierarchical structures decreased to lower than 1.4 % in the wavelength of 500–2500 nm. Besides, the hierarchical structures featured good hydrophobic performance with contact angle of 114°. This work provided a new way for the surface antireflection and hydrophobicity process, which could be widely used in the optical windows, and photoelectron devices.