Subwavelength Structures on Fused Silica for High-Power Laser Antireflection Applications

In the field of high-power lasers, subwavelength structures with both high transmittance and high laser damage resistance are required. However, in most of the studies, structural design tends to focus on optical properties. In this study, we research transmittance and surface electric field together. The surface light intensity, as an important damage factor, is investigated and quantitatively calculated using finite element method. Our results show that the surface light intensity has asymmetry on the front and rear surfaces, and is greatly regulated by the structural parameters. Based on this study, the subwavelength structures are designed which have both high transmittance and high laser damage resistance. Our research provides a new perspective to design of subwavelength structures, which is important for high-power laser antireflection applications.