Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-021-22462-z
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Funding
- Key Research and Development Program from Ministry of Science and Technology of China [2017YFA0303700, 2016YFA0202100]
- National Natural Science Foundation of China [11774163]
- University of Maryland
- National Institute of Standards and Technology Center for Nanoscale Science and Technology [70NANB14H209]
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The authors successfully demonstrate the generation of a generalized perfect Poincare beam with a wide spectrum using an all-dielectric metasurface platform, where the beam radius is independent of the topological charge number. This approach opens up new possibilities for optical information encryption.
The term Poincare beam, which describes the space-variant polarization of a light beam carrying spin angular momentum (SAM) and orbital angular momentum (OAM), plays an important role in various optical applications. Since the radius of a Poincare beam conventionally depends on the topological charge number, it is difficult to generate a stable and high-quality Poincare beam by two optical vortices with different topological charge numbers, as the Poincare beam formed in this way collapses upon propagation. Here, based on an all-dielectric metasurface platform, we experimentally demonstrate broadband generation of a generalized perfect Poincare beam (PPB), whose radius is independent of the topological charge number. By utilizing a phase-only modulation approach, a single-layer spin-multiplexed metasurface is shown to achieve all the states of PPBs on the hybrid-order Poincare Sphere for visible light. Furthermore, as a proof-of-concept demonstration, a metasurface encoding multidimensional SAM and OAM states in the parallel channels of elliptical and circular PPBs is implemented for optical information encryption. We envision that this work will provide a compact and efficient platform for generation of PPBs for visible light, and may promote their applications in optical communications, information encryption, optical data storage and quantum information sciences. Well-controlled Poincare beams are potentially useful in optical communications applications. Here, the authors present phase-only metasurfaces that generate broadband, perfect Poincare beams in the visible, with radius independent of the topological number.
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