An inexpensive and easily adaptable to industry scale method is Sol-Gel used to get a double layer anti-reflection coating thin film from SiO2/TiO2 by dip coating technique and we found that the Q H thickness SiO2/TiO2 Double layer thin film gets the best results so, we get a reflectance 0.002-0.02 for ultraviolet region, 0-0.04 for visible region, and 0.004-0.04 for Near infra-red region, and it is better than a thin film from SiO2 mono layer or thin film from TiO2 mono layer individually.
International Letters of Chemistry, Physics and Astronomy (Volume 56)
W. Abdullah "Fabrication of SiO2-TiO2 Double Layers Anti-Reflection Coating by Sol-Gel Method and Study of its Optical Properties", International Letters of Chemistry, Physics and Astronomy, Vol. 56, pp. 142-150, 2015