Structured Light Generation Using Angle‐Multiplexed Metasurfaces
Structured Light Generation Using Angle‐Multiplexed Metasurfaces
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DOI：
10.1002/adom.202300299
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发表时间：
2023-06
影响因子：
9
通讯作者：
Lin Deng;Renchao Jin;Yihao Xu;Yongmin Liu
中科院分区：
文献类型：
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作者：
Lin Deng;Renchao Jin;Yihao Xu;Yongmin Liu
在琼斯矩阵的基础上，通过将几个Meta原子组合到元表面的超晶胞中，已经证明了对光的振幅和相位的独立控制。然而，由于平面非手性结构的固有限制，一个琼斯矩阵中独立的复杂元素的最大数量为三个，从而产生高达三个通道的幅度和相位控制。在这项工作中，更多的琼斯矩阵对应于不同的入射角，建议增加，使自由度的幅度和相位控制可以进一步增加。所设计的元表面的超级单元由三个介电纳米块组成，它们在2D空间中具有预定义的旋转角度和位移，可以在遗传算法的帮助下反向确定。在实现四通道甚至八通道幅度和相位控制的能力的支持下，数值模拟了多结构光的产生，包括两个独立的完美庞加莱光束、两个双环完美庞加莱光束、两个完美庞加莱光束阵列和四个矢量涡旋光束阵列。这种新颖的设计有望有利于现代光学应用的发展，包括但不限于光通信、量子信息和信号加密。
On the basis of the Jones matrix, independent control over the amplitude and phase of light has been demonstrated by combining several meta‐atoms into the supercell of a metasurface. However, due to the intrinsic limitation of a planar achiral structure, the maximum number of independent, complex elements in one Jones matrix is three, giving rise to up to three‐channel amplitude and phase control. In this work, more Jones matrices corresponding to different angles of incidence are proposed to add, so that the degrees of freedom in the amplitude and phase control can be further increased. The supercell of the designed metasurfaces consists of three dielectric nanoblocks with predefined rotation angles and displacements in the 2D space, which can be inversely determined with the help of the genetic algorithm. Empowered by the ability to realize four‐ or even eight‐channel amplitude and phase control, the generation of multiple structured light, including two independent perfect Poincaré beams, two double‐ring perfect Poincaré beams, two perfect Poincaré beam arrays, and four vector vortex beam arrays, is numerically demonstrated. Such novel designs are expected to benefit the development of modern optical applications, including but not limited to optical communications, quantum information, and signal encryption.