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Optimization of Broadband Visible or Near Infrared Antireflection Coating Design by Scanning Search Method

A novel design algorithm based on a scanning search approach for designing a high-performance normal-incidence broadband visible or near infrared antireflection (AR) coating was proposed. The scanning search method consisting of scanning and elimination operations can be successively carried out to improve the AR performance and simplify the design structure; its design algorithm was straightforward and the resulting broadband AR performance was fairly good. It was shown that the average spectral reflectivities of the final designs in the visible region of 400–750 nm and in the NIR region of 800–1600 nm, obtained by the scanning search method of a two-material system, can be reduced below 0.042 and 0.085%, respectively.