Polarimetric Control of Reflective Metasurfaces

Abstract

Abstract-This letter addresses the synthesis of reflective cells approaching a given desired Floquet's scattering matrix. This work is motivated by the need to obtain much finer control of reflective metasurfaces by controlling not only their co-polarized reflection but also their cross-coupling behavior. The demonstrated capability will enable more powerful design approaches -involving all field components in phase and magnitude-and consequently better performance in applications involving reflective metasurfaces. We first expose some fundamental theoretical constraints on the cell scattering parameters. Then, a successful procedure for controlling all four scattering parameters by applying parallelogram and trapezoid transformations to square patches is presented, considering both normal and oblique incidence.

Gradient Metasurface With Both Polarization-Controlled Directional Surface Wave Coupling and Anomalous Reflection

“…If the reflection coefficients satisfy and , the reflective wave is (6) Thus, the helicity of the reflective wave is opposite to the incident wave, and due to the rotation of the ELCR, the phase of the reflective wave is changed relative to the structure without rotation. Obviously, for the left incident wave, the phase of the reflective wave is changed .…”

“…Recently, considerable interest is focused on metasurfaces that provide a new way to control the electromagnetic waves including surface waves [4], [5]. These properties make metasurfaces able be applied to antennas [6] [7], photonics devices [8], cloaks [9], [10], and polarizers [11], [12]. Different to the reflectarray, gradient metasurface is subwavelength and can couple the incident wave to surface wave [5] or spoof SPP [13].…”

Single-layer Linear-to-Circular Polarization Transformer Based on Periodic Strips Array

“…Researchers has recommended that avoid to use heavy waveguide walls and use two dimensional grating to design circular polarizer [17,18]. The polarization control is achieved by reflected waves for reflective metasurface [19]. Using an ultra-thin reflective metasurface to achieve broadband liner-to-circular polarization conversion [20].…”

Achieving wide-band linear-to-circular polarization conversion using ultra-thin bi-layered metasurfaces

“…Metasurfaces are periodic or quasi-periodic planar arrays of sub-wavelength elements. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The sub-wavelength unit cells always have more freedoms in manipulating the amplitude and phase of the reflected/ refracted waves. 7,8 Because of the ultra-thin thickness and low loss of metasurface-based polarization manipulators, many research interests have been concentrated in this field.…”

“…For example, the polarization control of the reflected waves for a reflective metasurface is studied. 9 Ultra-wideband linear-to-linear polarization conversion is achieved using an ultra-thin reflective metasurface. 10 An ultra-thin, broadband, and highly efficient tri-layered metasurface-based terahertz polarization converter that is capable of rotating a linear polarization state into its orthogonal one has been demonstrated due to the Fabry-perot-like resonance.…”