Wide-angle broadband antireflection coatings with nano-taper hydrated alumina film

• DOI: 10.1364/oe.464327
• Publication Date: 2022-07-14T08:00:35Z
• Authors: Hailan Wang; Chenying Yang; Yusi Wang; Wenjia Yuan; Tingting Zheng; Xiao Chen; Yujie Liu; Yueguang Zhang; Weidong Shen
• Keywords: Anti-reflective coating; Optical coating; Low emissivity

Wide-angle and broadband antireflection (AR) coating is of the essence in modern optical systems many fields, which has a great influence on stray light imaging quality. A simple convenient manufacturing method proposed to address this issue based composite combining nano-tapered Al2O3•xH2O (AH) structure high-low index thin film stack. The properties AH at various thickness are first studied modeled optics by several homogeneous sub-layers with graded equivalent index. designed AR coatings manufactured vacuum deposition wet etching subsequently hot deionized water. Compared common dielectric multilayer stack, presents excellent performance. measured average reflectance values double-side coated BK7 glass as low 0.40%, 0.41%, 0.56% 3.13% 400-1100nm band angles incidence (AOI) 6°, 20°, 40°, 60°, respectively, while transmittance normal increases up 99.3%. Finally, process reproductivity, environmental reliability test including long term storage, high temperature annealing 85°C-85% relative humidity storage evaluated. scheme provides low-cost, efficient, wide-angle for kinds large-curvature components complex surfaces fields consumer electronics, automotive, security, etc.