Abstract
The control of electromagnetic waves scattering is critical in wireless communications and stealth technology. Discrete metasurfaces not only increase the design and fabrication complex but also cause difficulties in obtaining simultaneous electric and optical functionality. On the other hand, discontinuous phase profiles fostered by discrete systems inevitably introduce phase noises to the scattering fields. Here we propose the principle of a scattering-harness mechanism by utilizing continuous gradient phase stemming from the spin-orbit interaction via sinusoidal metallic strips. Furthermore, by adjusting the amplitude and period of the sinusoidal metallic strip, the scattering characteristics of the underneath object can be greatly changed and thus result in electromagnetic illusion. The proposal is validated by full-wave simulations and experiment characterization in microwave band. Our approach featured by continuous phase profile, polarization independent performance and facile implementation may find widespread applications in electromagnetic wave manipulation.
Highlights
The control of electromagnetic waves scattering is critical in wireless communications and stealth technology
The scattering property of an object is quantitatively determined by virtue of its radar cross section (RCS), which decides how far the object can be detected by a radar system
Electromagnetic cloak based on the near-zero refractive index metamaterials was investigated[16]
Summary
The metamirror proposed here due to the gradient phase stemming from the SOI of continuously shaped planar metasurface would force the reflected beam of opposite handedness to propagate in well-defined ways Note that the RCS enhancement can be further improved by optimizing of period of the sinusoidal metallic strips to make the ±1 order scattering of metasurface is redirected back. Polarization independent electromagnetic illusion devices based on proposed continuously shaped metasurface have been numerically and experimentally demonstrated in microwave band for significant reduction or enhancement of the scattering cross section of an object, which can be subsequently pushed to the infrared and even the optical range by downscaling the sizes of the structural dimension. By utilizing dynamic control method[48,49], the performance of our device can be significantly improved
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