Generating Focused 3D Perfect Vortex Beams By Plasmonic Metasurfaces
Generating Focused 3D Perfect Vortex Beams By Plasmonic Metasurfaces
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DOI：
10.1002/adom.201701228
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发表时间：
2018-02
影响因子：
9
通讯作者：
Yuchao Zhang;Weiwei Liu;Jie Gao;Xiaodong Yang
中科院分区：
文献类型：
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作者：
Yuchao Zhang;Weiwei Liu;Jie Gao;Xiaodong Yang
完美涡旋(PV)光束具有与拓扑电荷无关的环形强度分布，有望在粒子操纵、光纤通信和量子光学方面取得重大进展。光伏光束通常由贝塞尔-高斯光束的傅里叶变换产生。然而，传统的产生光伏光束的方法需要一系列体积庞大的光学元件，这大大增加了系统的复杂性，也阻碍了光子器件的集成。本文基于Pancharatnam-Berry相位，将轴锥、螺旋相板和傅里叶变换透镜的相位分布同时结合，设计并演示了由矩形孔纳米天线作为集成波束转换器制成的等离子体亚表面，从而在宽波长范围内产生聚焦的三维光伏光束。研究表明，在变表面设计中，可以通过改变几个控制参数来调整光伏梁结构。此外，还产生了具有任意排列和拓扑电荷的多个光伏光束。这些结果有可能使新型紧凑型光学器件成为可能，用于定制复杂的光束和发展基于亚表面的功能集成光子芯片。
Perfect vortex (PV) beams possessing annular intensity profiles independent of topological charges promise significant advances in particle manipulation, fiber communication, and quantum optics. The PV beam is typically generated from the Fourier transformation of the Bessel–Gauss beam. However, the conventional method to produce PV beams requires a series of bulky optical components, which greatly increases the system complexity and also hinders the photonic device integration. Here, plasmonic metasurfaces made of rectangular‐hole nanoantennas as integrated beam converters are designed and demonstrated to generate focused 3D PV beams in a broad wavelength range, by combining the phase profiles of axicon, spiral phase plate, and Fourier transform lens simultaneously based on the Pancharatnam–Berry phase. It is demonstrated that the PV beam structures can be adjusted by varying several control parameters in the metasurface design. Moreover, multiple PV beams with arbitrary arrangement and topological charges are also produced. These results have the promising potential for enabling new types of compact optical devices for tailoring complex light beams and advancing metasurface‐based functional integrated photonic chips.