arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.09956physics.optics
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偏振加密轨道Angular Momentum复用超表面全息术

Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography

Hongqiang Zhou, Basudeb Sain, Yongtian Wang, Christian Schlickriede, Ruizhe Zhao, Xue Zhang, Qunshuo Wei, Xiaowei Li, Lingling Huang, Thomas Zentgraf

摘要:

超表面全息术具有通过薄层实现复杂波前调制的优点,并与计算机全息成像技术相结合。尽管众所周知的光参数,如振幅,相位,偏振和频率,光束的轨道角动量(OAM)可以被视为另一个自由度。在这里,我们提出并证明了轨道角动量复用在不同的偏振信道使用双折射超表面全息加密。OAM选择性全息信息的再现需要精确的拓扑电荷和特定的偏振态。通过使用具有不同拓扑电荷的入射光束作为擦除器,我们模拟了重建图像的超分辨率情况,类似于显微镜中众所周知的STED技术。多个偏振通道与轨道角动量选择性的组合为全息加密提供了更高的安全级别。这种技术可以应用于光束整形、光学伪装、数据存储和动态显示。

英文摘要:

Metasurface holography has the advantage of realizing complex wavefront modulation by thin layers together with the progressive technique of computer-generated holographic imaging. Despite the well-known light parameters, like amplitude, phase, polarization and frequency, the orbital angular momentum (OAM) of a beam can be regarded as another degree of freedom. Here, we propose and demonstrate orbital angular momentum multiplexing at different polarization channels using a birefringent metasurface for holographic encryption. The OAM selective holographic information can only be reconstructed with the exact topological charge and a specific polarization state. By using an incident beam with different topological charges as erasers, we mimic a super-resolution case for the reconstructed image, in analogy to the well-known STED technique in microscopy. The combination of multiple polarization channels together with the orbital angular momentum selectivity provides a higher security level for holographic encryption. Such a technique can be applied for beam shaping, optical camouflage, data storage, and dynamic displays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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