Orbital angular momentum transformation of optical vortex with aluminum metasurfaces
Orbital angular momentum transformation of optical vortex with aluminum metasurfaces
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DOI：
10.1038/s41598-019-45727-6
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发表时间：
2019-06
影响因子：
4.6
通讯作者：
Yuchao Zhang;Xiaodong Yang;Jie Gao
中科院分区：
文献类型：
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作者：
Yuchao Zhang;Xiaodong Yang;Jie Gao
利用焦散理论导出的相位分布，利用铝超颖表面实现了光涡旋的轨道角动量（OAM）变换。所产生的OAM变换光束具有定义明确的类贝塞尔图案，其具有从-1到+2.5的多个设计拓扑荷，包括沿传输的整数阶和分数阶光学涡旋沿着。详细的OAM转换过程中观察到的光束强度和相位分布的变化。进一步分析了在这种变换过程中OAM模密度的动态分布，说明了总OAM的守恒性。光学涡旋光束的OAM态任意变换的演示将在光学操纵、量子光学和光通信等方面产生许多新的应用。
The orbital angular momentum (OAM) transformation of optical vortex is realized upon using aluminum metasurfaces with phase distributions derived from the caustic theory. The generated OAM transformation beam has the well-defined Bessel-like patterns with multiple designed topological charges from −1 to +2.5 including both the integer-order and fractional-order optical vortices along the propagation. The detailed OAM transformation process is observed in terms of the variations of both beam intensity and phase profiles. The dynamic distributions of OAM mode density in the transformation are further analyzed to illustrate the conservation of the total OAM. The demonstration of transforming OAM states arbitrarily for optical vortex beams will lead to many new applications in optical manipulation, quantum optics, and optical communication.