Design of Single-Layer Polarization-Dependent Transmissive and Reflective Focusing Metasurface

A polarization-dependent transmissive and reflective phase-gradient metasurface (PGMS) is investigated and experimentally verified in the Ku-band. The PGMS is based on a single-layer substrate-integrated element, which consists of a cross-shaped dielectric unit and a couple of metallic strips/patches that are printed on the dielectric unit. Taking advantage of both the dielectric and the metallic components, the proposed element can transmit or reflect the linearly polarized (LP) incident wave depending on its polarization. Moreover, the phase of the transmitted or reflected wave can be independently controlled by different phase-control parameters. As a result, two independent foci can be obtained on the transmission and reflection sides of the PGMS for two orthogonal LP waves. For demonstration, a prototype of the PGMS is fabricated and tested. Both the transmissive and reflective foci are observed at the target positions. Also, the PGMS is shown to be able to manipulate the wavefronts independently on its two sides by adjusting the phase distributions. These features make the proposed PGMS a great choice for use in polarization identification, near-field energy transfer, or far-field wireless communication.

Automated summary

This study investigates a polarization-dependent transmissive and reflective metasurface in the Ku-band, demonstrating the ability to transmit or reflect linearly polarized waves based on polarization state and independently control phase. Experimental results show the generation of two independent foci and manipulation of wavefronts on both sides of the metasurface. These features make the proposed metasurface suitable for polarization identification, near-field energy transfer, and far-field wireless communication.