Diatomic metasurface based broadband J-plate for arbitrary spin-to-orbital conversion
Diatomic metasurface based broadband J-plate for arbitrary spin-to-orbital conversion
复制标题
基于双原子超表面的宽带 J 板，用于任意自旋到轨道转换
DOI：
10.1088/1361-6463/ab2229
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发表时间：
2019-06
期刊：
影响因子：
--
通讯作者：
Li Xiangping
中科院分区：
文献类型：
--
作者：
Wang Shuai;Li Fengjun;Deng Junhong;Ye Xuan;Deng Zi Lan;Cao Yaoyu;Guan Bai Ou;Li Guixin;Li Xiangping
实现光的自旋-轨道角动量转换的传统光学元件只能允许将相反的自旋角动量（SAM）态转换为相反的轨道角动量（OAM）态。这种限制最近被一种基于超表面的J板打破，该J板具有组合的几何和传播相位设计，可以将任意SAM转换为具有独立OAM的角动量状态。然而，传播相位的固有色散性质将其带宽限制在特定波长。在这里，我们展示了一个J-板，可以实现任意的自旋到轨道角动量转换在一个宽的带宽从650 nm到900 nm。这是通过一种新的双原子元表面设计，通过结合几何相位和迂回相位，这两者都是完全解耦的元原子的光谱响应，从而内在的宽带。利用这种J板实现宽带任意自旋-轨道转换和矢量涡旋光束的实验，为高性能光的自旋-轨道相互作用开辟了新的途径。
Conventional optical elements to realize spin-to-orbital angular momentum conversion of light can only allow conversion of opposite spin angular momentum (SAM) states into opposite orbital angular momentum (OAM) states. This limitation was recently broken by a metasurface based J-plate with combined geometric and propagation phase design that can convert arbitrary SAM into angular momentum states with independent OAM. However, the intrinsic dispersive nature of the propagation phase restricts its bandwidth to a specific wavelength. Here, we demonstrate a J-plate that can realize arbitrary spin-to-orbital angular momentum conversion in a broad bandwidth from 650 nm to 900 nm. This is achieved through a novel diatomic metasurface design by combining the geometric phase and detour phase, both of which are completely decoupled from the spectral response of meta-atoms and thus intrinsic broadband. The demonstration of broadband arbitrary spin–orbit-conversion and vector vortex beams by such J-plate significantly opens new routes for high-performance spin-orbital interaction of light.
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影响因子：
35
作者：
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影响因子：
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作者：
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