Design and Implementation of Wide-Angular Universal Broadband Visible Antireflection Coating for Various Substrates

摘要

We proposed a simple design method based on a scanning search algorithm for obtaining an acceptable wide-angular universal visible (vis) antireflection (AR) coating design with the incident angles over the range 0-30° for different glass substrates having refractive indices ranging from 1.472 to 1.750. We then applied AR-coating to seven different glass substrates in the same deposition run using ion-assisted deposition. It was shown that the measured and calculated wide-angular universal vis AR effects were in agreement, where the total average vis reflectances at angles 0 and 30° for the practical AR-coated substrates can be effectively reduced from 5.92 and 6.09% (uncoated substrates) to below 0.25 and 0.34%, respectively, which are comparable to the calculated reflectance values of 0.22 and 0.33%, revealing that an acceptable wide-angular universal vis AR performance can be obtained.