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Design of multilayer metamaterial functional layers with robust constitutive parameters

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Document pages: 13 pages

Abstract: We propose a multi-layer metamaterial functional layer design with robust effective parameters. The functional layer consists of two identical dielectric material layers and a metal structure sandwiched in the middle. The symmetrical design ensures that, according to the standard retrieval technology, the effective parameters retrieved by a single functional layer in vacuum can be used to characterize its electromagnetic contribution when stacked in a multilayer system. When applied to fishnet structure, the effective parameters of symmetric functional layer system are robust to the change of layer number. Symmetrical functional layer design is also studied on multilayer metamaterials, which are composed of several layers of different kinds of metal materialsuctures. Transmission and reflection spectra are obtained for real structures and their effective models by finite-differential-time-domain simulation and transfer matrix method calculation, respectively. It turns out that the effective model shows great equivalency to the real structures, and the effective parameters of symmetric functional layer design are robust at both normal and oblique incident cases. Our work provides a practical approach to design and characterize multilayer metamaterials with the well-known effective parameters retrieval technique.

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