Abstract
Researches of AR coating had been studied for a long time, but most of them focused on vertical-incident part. In this paper, we would find out the kind of ideal AR coating which could be used for every incident angle. Based on the characteristic matrix theory, we wrote the computer program to calculate the average reflectance for p- and s-polarization of different AR coating structures on the glass for visible spectral.We designed the ideal AR coating by using of the inhomogeneous structure with refractive index changing from air to substrate. The numerical results were discussed by discussing the distribution of index change, the numbers of layers and the thickness of coatings to obtain the most effective AR coating.After series of discussion, we obtain the best refractive index distribution for 10-layers. The average reflectance was less than 0.01 over the whole spectral region up to 80°, and its result was close to that of the ideal AR coating. we also develop the best index distribution for 5-layers structure.For practical manufacturing, we decreased numbers of layers and raised the initial index of coating, however the effects were better than that of the traditional 4-layers AR coating. At last we brought up some methods to fabricate ideal AR coating for the future work.