Broadband generation of perfect Poincaré beams via dielectric spin-multiplexed metasurface

Mingze Liu, Pengcheng Huo, Wenqi Zhu, Cheng Zhang, Si Zhang, Maowen Song, Song Zhang, Qianwei Zhou, Lu Chen, Henri J. Lezec, Amit Agrawal, Yanqing Lu () and Ting Xu ()
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Mingze Liu: Nanjing University
Pengcheng Huo: Nanjing University
Wenqi Zhu: National Institute of Standards and Technology
Cheng Zhang: Huazhong University of Science and Technology
Si Zhang: Nanjing University
Maowen Song: Nanjing University
Song Zhang: Nanjing University
Qianwei Zhou: Nanjing University
Lu Chen: National Institute of Standards and Technology
Henri J. Lezec: National Institute of Standards and Technology
Amit Agrawal: National Institute of Standards and Technology
Yanqing Lu: Nanjing University
Ting Xu: Nanjing University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract The term Poincaré 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 Poincaré beam conventionally depends on the topological charge number, it is difficult to generate a stable and high-quality Poincaré beam by two optical vortices with different topological charge numbers, as the Poincaré 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 Poincaré 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 Poincaré 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.

Date: 2021
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DOI: 10.1038/s41467-021-22462-z

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