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Direct routing of intensity-editable multi-beams by dual geometric phase interference in metasurface
Nanophotonics ( IF 7.5 ) Pub Date : 2020-06-29 , DOI: 10.1515/nanoph-2020-0203
Guowen Ding 1 , Ke Chen 1 , Xinyao Luo 1 , Guangxu Qian 1 , Junming Zhao 1 , Tian Jiang 1 , Yijun Feng 1
Affiliation  

Abstract Controlling spin electromagnetic waves by ultra-thin Pancharatnam-Berry (PB) metasurfaces show promising prospects in the optical and wireless communications. One of the major challenge is to precisely control over the complex wavefronts and spatial power intensity characteristics without relying on massive algorithm optimizations, which requires independent amplitude and phase tuning. However, traditional PB phase can only provide phase control. Here, by introducing the interference of dual geometric phases, we propose a metasurface that can provide arbitrary amplitude and phase manipulations on meta-atom level for spin waves, achieving direct routing of multi-beams with desired intensity distribution. As the experimental demonstration, we design two microwave metasurfaces for respectively controlling the far-field and near-field multi-beam generations with desired spatial scatterings and power allocations, achieving full control of both sophisticated wavefronts and their energy distribution. This approach to directly generate editable spatial beam intensity with tailored wavefront may pave a way to design advanced meta-devices that can be potentially used in many real-world applications, such as multifunctional, multiple-input multiple-output and high-quality imaging devices.

中文翻译:

通过超表面中的双几何相位干涉直接路由强度可编辑的多光束

摘要 通过超薄 Pancharatnam-Berry (PB) 超表面控制自旋电磁波在光和无线通信中显示出广阔的前景。主要挑战之一是在不依赖大规模算法优化的情况下精确控制复杂的波前和空间功率强度特性,这需要独立的幅度和相位调谐。但是,传统的PB相位只能提供相位控制。在这里,通过引入双几何相位的干扰,我们提出了一种超表面,可以在超原子水平上为自旋波提供任意幅度和相位操作,实现具有所需强度分布的多光束的直接路由。作为实验演示,我们设计了两个微波超表面,分别控制具有所需空间散射和功率分配的远场和近场多波束生成,实现对复杂波前及其能量分布的完全控制。这种直接生成具有定制波前的可编辑空间光束强度的方法可能为设计先进的元设备铺平道路,这些元设备有可能用于许多实际应用,例如多功能、多输入多输出和高质量成像设备.
更新日期:2020-06-29
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