Arbitrary Power-Conserving Field Transformations With Passive Lossless Omega-Type Bianisotropic Metasurfaces

By A. Epstein, George V. Eleftheriades. IEEE Transactions on Antennas and Propagation, 2016

267 citations recorded by the source corpus.

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 paper, we prove that any field transformation that 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, which exhibit negligible magnetoelectric coupling, O-BMSs are not limited to controlling the phase of transmitted fields, but can rather achieve a 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 the development of O-BMS-based devices for controlling the near and far fields of arbitrary sources in complex scattering configurations.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/331816b6717b94796e6737ff8a220be1922eeaae

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aerospace Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Metasurfaces and their applications (2018, background): “Figure 6F shows such a surface consisting of three impedance sheets stacked together to achieve better impedance match from both sides, ensuring very low reflections for a wide range of incident angles using simple passive structures [110, 111].”
Wave-front Transformation with Gradient Metasurfaces (2016, background): “, for refracting metasurfaces and/or polarization conversion, bianisotropy may relax the local amplitude modulation along the surface [35,36].”
Roadmap on metasurfaces (2019, background): “Single metasurfaces above a thin cavity have also been reported that tailor cavity modes into arbitrary aperture fields [8, 9].”
Susceptibility Derivation and Experimental Demonstration of Refracting Metasurfaces Without Spurious Diffraction (2018, background): “2793958 diffraction-free refraction in short, by introducing more complexity in the metasurface design [15], [16].”
A Metasurfaces Review: Definitions and Applications (2019, methodology): “The use of multi-layered Huygen’s metasurfaces to structure a bianisotropic metasurface has been proposed in [94].”