Abstract
A design procedure, based on the flip-flop tuning search algorithm, is applied to design universal visible antireflection coatings for various substrates with indices 1.45, 1.50, 1.55, 1.60, 1.65, 1.70, 1.75 and 1.784. The universal broadband antireflection coating designs obtained by the flip-flop tuning method for a two-material and a three-material system with 80 sublayers of 300 nm thickness starting at high index and middle index lead to 10-layer structures, and the average reflectivities of these designs for the eight different substrates over the entire visible spectral region (400–750 nm) decrease to lower than 0.199% and 0.201%, respectively. Although the antireflection performance for each substrate is somewhat less than the optimum, it is acceptable for most applications.
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