Broadband and high-efficiency polarization rotation using a single-layer transmissive metastructure

A single-layer, free-standing metamaterial polarization rotator has been proposed, which achieves broadband and high-efficiency linear polarization rotation in transmission mode. The structure comprises a metal slab perforated with an array of subwavelength holes, each containing an embedded twisted U-shaped meander wire. By using the coupling between the perforated slab and the four adjacent excited modes of the meander wires, the incident linearly polarized wave is efficiently captured by the receiving arms and reradiated from the reradiating arms with a controllable polarization rotation angle. The proposed design offers a simple, efficient, and flexible approach to polarization manipulation, demonstrating potential value for applications in microwave and communication systems.