High-efficiency and multi-frequency polarization converters based on graphene metasurface with twisting double L-shaped unit structure array

Abstract

In this work, a high-efficiency and tunable dual-frequency reflective polarization converter composed of graphene metasurface with twisting double L-shaped unit is firstly realized. Numerical results demonstrate that the device can convert a linearly polarized wave to its cross-polarized wave, and meantime it can also convert to a circularly polarized wave. Subsequently, one thickness of 500 nm SiO 2 layer sandwiched by two graphene metasurfaces with similar pattern is stacked on the top of the two-layered structure, a four-frequency efficient reflective polarization converters is realized. Above all, those working frequencies can also be dynamically tuned within a large frequency range by adjusting the Fermi energy of the graphene, without reoptimizing and refabricating the nanostructures, which paves a novel way toward developing a controllable polarization converter for mid-infrared applications.

Tunable broadband polarization converters based on coded graphene metasurfaces

“…The tunability of graphene based metasurfaces is obtained by adjusting the chemical potential of graphene with different applied bias voltages 16 . In recent years a lot of graphene based patterned metasurfaces have been presented as polarization converters for terahertz and midinfrared frequencies 17 , 18 .…”

Ultra-Broadband Polarization Conversion Meta-Surface and its Application in Polarization Converter and RCS Reduction

“…However, narrow operating bandwidth and complex designs extremely limit their practical applications. Reflective polarization converters have important advantages in energy efficiency compared to transmission polarization converters and many structures have been reported, such as V-shaped [32], cut wire shaped [33,34], L-shaped [35,36], double U-shaped [37], double Wshaped [38] and double split ring [39]. However, up to now, only a small amount of work can achieve the ultra-broadband, high-efficiency and tractable geometry at the same time, especially in the terahertz region.…”

High-Efficiency Dual-Frequency Reflective Linear Polarization Converter Based on Metasurface for Microwave Bands

“…Yu et al [32] proposed a V-shaped nanoantenna to achieve line-to-circular polarization conversion in the optical frequency band. A cross-reflective polarization converter operating over a large frequency range with high efficiency was reported by Chen et al [33]. The chiral metasurface is considered to be an effective method for transmission polarization manipulation components which can convert all polarization types, including linear-to-circular, linear-to-linear, and circular-to-circular polarization conversion.…”