期刊
ACS NANO
卷 14, 期 5, 页码 5553-5559出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b09814
关键词
metasurface holography; all-dielectric metasurface; polarization-encryption; orbital angular momentum; multiplexing; vortex beam array
类别
资金
- National Key R&D Program of China [2017YFB1002900]
- European Research Council (ERC) under the European Union [724306]
- NSFC-DFG [ZE953/11-1, 61861136010]
- Beijing Outstanding Young Scientist Program [BJJWZYJH01201910007022]
- National Natural Science Foundation of China [61775019]
- Beijing Municipal Natural Science Foundation [4172057]
- Beijing Nova Program [Z171100001117047]
- Fok Ying-Tong Education Foundation of China [161009]
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.
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