title: Fully Controllable Pancharatnam-Berry Metasurface Array with High Conversion Efficiency and Broad Bandwidth.
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.
authors.affiliation: Key Laboratory of Environmental Fracture (Ministry of Education), University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Chuanbao
authors.initials: C
authors.lastname: Liu
authors.affiliation: Key Laboratory of Environmental Fracture (Ministry of Education), University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Bai
authors.affiliation: State Kay Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: State Key Laboratory for Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China.
authors.forename: Yihao
authors.initials: Y
authors.lastname: Yang
authors.affiliation: State Key Laboratory for Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China.
authors.forename: Hongsheng
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China.
authors.forename: Ji
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Environmental Fracture (Ministry of Education), University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Lijie
authors.initials: L
authors.lastname: Qiao