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Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography.


ABSTRACT: 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, such as 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.

SUBMITTER: Zhou H 

PROVIDER: S-EPMC7254835 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography.

Zhou Hongqiang H   Sain Basudeb B   Wang Yongtian Y   Schlickriede Christian C   Zhao Ruizhe R   Zhang Xue X   Wei Qunshuo Q   Li Xiaowei X   Huang Lingling L   Zentgraf Thomas T  

ACS nano 20200504 5


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, such as 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 metas  ...[more]

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