An ORMOSIL porous double-layer broadband antireflective coating
A λ/4–λ/4 broadband antireflective coating is developed using a sol-gel dip coating method. By adding SAR-5 organosilicon resin into a base-catalyzed silica sol top layer and treating at 300°C, a broadband antireflective coating used for blast-shields with a high average transmission of 99.34% (450–950 nm) and good hydrophobicity (with a water contact angle of 119°) was obtained. After being subjected to rubbing 50 times and being maintained at a relative humidity of around 95% for 50 d, the average transmission of the coating decreased by 0.29% and 0.04%, respectively. This indicates that the organically modified silica broadband antireflective coating has good abrasion resistance and humidity stability.
Xiong Huai,Tang Yongxing,Hu Lili,Li Haiyuan. An ORMOSIL porous double-layer broadband antireflective coating[J].Chinese Optics Letters,2019,17(3):03.