Light beams carrying spin angular momentum (SAM) and orbital angular momentum (OAM) have created novel opportunities in the areas of optical communications, imaging, micromanipulation, and quantum optics. However, complex optical setups are required to simultaneously manipulate, measure, and analyze these states, which significantly limit system integration. Here, a detection approach is introduced for measuring multiple SAM and OAM modes simultaneously through a planar nanophotonic demultiplexer based on an all‐dielectric metasurface. Coaxial light beams carrying multiple SAM and OAM states of light upon transmission through the demultiplexer are spatially separated into a range of vortex beams with different topological charge, each propagating along a specific wavevector. The broadband response and momentum conservation further enable the demultiplexer to achieve wavelength demultiplexing. The ultracompact multifunctional architecture is envisioned to enable simultaneous manipulation and measurement of polarization and spin encoded photon states with applications in integrated quantum optics and optical communications.

中文翻译：

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介电超表面宽带检测多个自旋和轨道角莫曼塔

带有自旋角动量（SAM）和轨道角动量（OAM）的光束在光通信，成像，显微操作和量子光学领域创造了新的机遇。但是，需要复杂的光学设置来同时操纵，测量和分析这些状态，这严重限制了系统集成。在这里，介绍了一种检测方法，该方法可通过基于全介电超表面的平面纳米光子解复用器同时测量多个SAM和OAM模式。通过解复用器传输时，带有多个SAM和OAM状态的同轴光束在空间上分为一系列具有不同拓扑电荷的涡旋光束，每个涡旋光束都沿着特定的波矢传播。宽带响应和动量守恒进一步使解复用器能够实现波长解复用。设想了超紧凑的多功能体系结构，以实现在集成量子光学和光通信中的应用，同时实现偏振和自旋编码光子状态的操纵和测量。