Arbitrary power-conserving field transformations with passive lossless omega-type bianisotropic metasurfaces

TL;DR

This paper develops a comprehensive theory for designing passive, lossless omega-type bianisotropic metasurfaces capable of arbitrary field transformations, including complex scattering scenarios, using practical implementation structures.

Contribution

It introduces a closed-form design methodology for passive, lossless O-BMSs that can implement any locally power-conserving field transformation, expanding their application scope.

Findings

Design of O-BMSs for reflectionless wide-angle refraction

Implementation of O-BMSs using asymmetric impedance sheets

Validation through full-wave simulations of various field control devices

Abstract

We present a general theory for designing realistic omega-type bianisotropic metasurfaces (O-BMSs), unlocking their full potential for molding electromagnetic fields. These metasurfaces, characterized by electric surface impedance, magnetic surface admittance, and magnetoelectric coupling coefficient, were previously considered for wavefront manipulation. However, previous reports mainly considered plane-wave excitations, and implementations included cumbersome metallic features. In this work, we prove that any field transformation which locally conserves real power can be implemented via passive and lossless meta-atoms characterized by closed-form expressions; this allows rigorous incorporation of arbitrary source and scattering configurations. Subsequently, we show that O-BMS meta-atoms can be implemented using an asymmetric stack of three impedance sheets, an appealing structure for printed circuit board fabrication. Our formulation reveals that, as opposed to Huygens' metasurfaces (HMSs), which exhibit negligible magnetoelectric coupling, O-BMSs are not limited to controlling the phase of transmitted fields, but can rather achieve high level of control over the amplitude and phase of reflected fields. This is demonstrated by designing O-BMSs for reflectionless wide-angle refraction, independent surface-wave guiding, and a highly-directive low-profile antenna, verified with full-wave simulations. This straightforward methodology facilitates development of O-BMS-based devices for controlling the near and far fields of arbitrary sources in complex scattering configurations.