In this paper, a strategy to achieve a simultaneous wavefront shaping and polarization rotation, without compromising the number of pixels and energy efficiency as well as having broadband operation range, is proposed. This strategy is based on the application of a spin-decoupled phase metasurface composed by only one set of metal-insulator-metal (MIM) umbrella-shaped chiral unit cells. Quasi-non-dispersive and spin-decoupled phase shift can be achieved simply by changing single structural parameter of the structure. By further merging the Pancharatnam-Berry (PB) geometric phase, conversion of an incident LP light beam into right- and left-handed circularly polarized reflected beams with similar amplitudes, desired phase profiles and controlled phase retardation on a nanoscale is enabled with high efficiency. Based on the proposed strategy, a polarization-insensitive hologram generator with control optical activity, and a multiple ring vortex beam generator are realized. The results obtained in this work provide a simple and pixel-saving approach to the design of integratable and multitasking devices combining polarization manipulation and wavefront shaping functions, such as vectorial holographic generators, multifocal metalenses, and multichannel vector beam generators.

中文翻译：

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用于宽带和像素节省的偏振旋转和波前控制的自旋解耦超表面

在本文中，提出了一种在不影响像素数量和能源效率以及宽带操作范围的情况下同时实现波前整形和偏振旋转的策略。该策略基于自旋解耦相超表面的应用，该超表面仅由一组金属-绝缘体-金属 (MIM) 伞形手性晶胞组成。只需改变结构的单个结构参数即可实现准非色散和自旋解耦相移。通过进一步合并 Pancharatnam-Berry (PB) 几何相位，可以高效地将入射 LP 光束转换为具有相似幅度、所需相位分布和受控相位延迟的右旋和左旋圆偏振反射光束。 . 根据提出的战略，实现了具有控制光学活性的偏振不敏感全息图发生器和多环涡旋光束发生器。在这项工作中获得的结果为设计结合偏振操纵和波前整形功能的可集成和多任务设备提供了一种简单且节省像素的方法，例如矢量全息发生器、多焦点超透镜和多通道矢量光束发生器。