Visible and near infrared, wide-angle, anti-reflection coatings with self-cleaning on glass

• DOI: 10.1364/ome.2.000969
• Publication Date: 2012-06-22T21:09:42Z
• Authors: Kelly Cristine Ca...; Alexandre Fassini...; Fabiano Severo Ro...; Matheus Francioni...; Flavio Horowitz
• Keywords: Visible spectrum; Reflection

In this work self-cleaning and transparent surfaces were produced on glass surface with simultaneous wide-angle good optical transmittance the visible region. These properties are pursued by combination of multi-scale topology based silica nanoparticles (SNPs), index grading interference coating, as well polytetrafluoroethylene (PTFE) self-assembly, using two approaches. first, two-layer approach (glass/SNPs/PTFE), resulting samples presented a water contact angle (WCA) 169° ± 2° very low hysteresis, significant antireflection. The second, three-layer (glass/SNPs/silica aerogel/PTFE), WCA 158° also hysteresis (<5°), in addition to normal 99% or higher, which decreased less than 2% at 20° incidence. results show that proper structure-coated glass, graded-index effects, may provide antireflection properties.