Abstract
A synthesis method based on a spiraling search algorithm is applied to design a low-loss normal-incidence wideband visible antireflection coating. The design algorithm of the spiraling search is straightforward and the resultant visible antireflection (AR) performance is fairly good. It was shown that the average visible spectral reflectivity over the 400–750 nm region of the final design, obtained by the spiraling search method for a two-material 50-layer system, can be reduced to lower than 0.044%, that the maximum visible reflectivity can be reduced to less than 0.44%, and that the residual reflectivity in the mainly visible region of 415–740 nm can be reduced to below than 0.066%.
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