Fabry-Perot Huygens' metasurfaces: On homogenization of electrically thick composites

Article

关键词: ELECTROMAGNETIC-FIELDS;    WAVE-FRONT;    DESIGN;   

DOI  :  10.1103/PhysRevB.100.115144

来源: SCIE

【 摘 要 】

Realization of the anomalous refraction effects predicted by Huygens' metasurfaces (HMS) has required tedious and time-consuming trial-and-error numerical full-wave computations. It is shown herein that these requirements can be alleviated for transverse magnetic propagation by a periodic dielectric-based HMS consisting of an electrically thick array of cascaded Fabry-Perot etalons. This Fabry-Perot HMS (FP-HMS) is easily designed to mimic the local scattering coefficients of a standard zero-thickness HMS (ZT-HMS) which, according to homogenization theory, should result in the desired anomalous refraction. To probe the characteristics of this practical FP-HMS, a method based on Floquet-Bloch (FB) analysis is derived for predicting the fields scattered from it for arbitrary angles of incidence. This method produces simple closed-form solutions for the FB wave amplitudes and the resulting fields are shown to agree well with full-wave simulations. These predictions and full-wave simulations verify the applicability of homogenization and scattering properties of ZT-HMSs to thick structures. They also verify the proposed semianalytical microscopic design procedure for such structures, offering an effective alternative path to implementation of theoretically envisioned intricate field manipulating devices.

【 授权许可】

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