Micro- and macroscopic simulation of periodic metamaterials

[摘要] In order to characterize three-dimensional, left-handed metamaterials (LHM)we use electromagnetic field simulations of unit cells. For waves travelingin one of the main directions of the periodic LHM-arrays, the analysis isconcentrated on the calculation of global quantities of the unit cells, suchas scattering parameters or dispersion diagrams, and a careful interpretationof the results. We show that the concept of equivalent material values –which may be negative in a narrow frequency range – can be validated bylarge "global" simulations of a wedge structure. We also discuss thelimitations of this concept, since in some cases the macroscopic behavior ofan LHM cannot be accurately described by equivalent material values.

[学科分类] 电子、光学、磁材料