Abstract
Metasurfaces have powerful abilities to manipulate the properties of electromagnetic waves flexibly, especially the modulation of polarization state for both linearly polarized (LP) and circularly polarized (CP) waves. However, the transmission efficiency of cross-polarization conversion by a single-layer metasurface has a low theoretical upper limit of 25% and the bandwidth is usually narrow, which cannot be resolved by their simple additions. Here, we efficiently manipulate polarization coupling in multilayer metasurface to promote the transmission of cross-polarization by Fabry-Perot resonance, so that a high conversion coefficient of 80–90% of CP wave is achieved within a broad bandwidth in the metasurface with C-shaped scatters by theoretical calculation, numerical simulation and experiments. Further, fully controlling Pancharatnam-Berry phase enables to realize polarized beam splitter, which is demonstrated to produce abnormal transmission with high conversion efficiency and broad bandwidth.
Highlights
As the striking features mentioned above, intensive researches are carried out to develop metasurfaces modulating circularly polarized (CP) wave
We design a rather simple multilayer metasurface array relying on the interference of polarization couplings in the multi-transmission process resulting in enhancement for the transmitted fields of CP cross-polarization and reduction for other scattering fields
To better understand the interaction between C-shaped SRR and CP wave, the electric field of CP wave is decomposed along two optical axises vertical and parallel to the gap, respectively, and the transmission coefficient is calculated based on Jones Matrix[34], ( ) T
Summary
As the striking features mentioned above, intensive researches are carried out to develop metasurfaces modulating CP wave. Since single-layer metallic metasurface cannot completely control phase while maintaining a high conversion efficiency, some researchers adopted all-dielectric metasurface[22] or multilayer structure[29,30] to overcome the shortcomings due to an additional magnetic response from Mie scattering or loop current by cascading metallic layers, leading to near unit transmission and full phase coverage. These reflectionless metasurfaces can be designed by the Huygens’ principle[29,30,31] or rigorous filter theory[32]. A gradient metasurface array is demonstrated to bend the transmitted beam in arbitrarily trajectory
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