High-Efficiency Compact Huygens' Metasurface for Orbital Angular Momentum Generation

Huygens' metasurface provides powerful method to designing high-efficiency meta-devices via balancing the electric/magnetic responses at the interface. However, most of the previously reported works operate in the transmission mode, leaving the reflection property to be unexploited. In this paper, a novel miniaturized reflective Huygens' meta-atom and metasurface is proposed. It comprises one vertically placed modified split resonant ring resonator (MSRR) and one planar terminally-bent electric dipole resonator (TBEDR), which provides the required magnetic and electric responses for constructing the Huygens resonance, respectively. Through judiciously adjustment on the key structural parameters, nearly full
$2\pi$
reflection phase coverage is easily fulfilled together with high reflectance. As proof-of-concept demonstration, a high-efficiency reflective OAM generator is designed and simulated, and a good coincidence is witnessed between the simulation results and the design goals. The proposed work with merits of high-efficiency, compact size can be competitive candidate for the six-generation (6G) wireless communication system.