Advanced effective medium approximation for subwavelength multilayers to overcome Maxwell-Garnet approach breakdown

摘要

We develop a more precise definition of effective medium approximation for subwavelength multilayer structures. It allows to overcome anomalous behavior of the ordinary Maxwell-Garnet effective medium for all-dielectric multilayers, investigated theoretically and observed experimentally. We reveal that the correct effective medium should possess both magnetic and gyrotropic properties, and revels spatial dispersion. We show that the transmission through this effective medium well matches with that of the generic multilayer in the cases when the ordinary effective medium fails.