4.6 Article

A quasi-continuous all-dielectric metasurface for broadband and high-efficiency holographic images

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 53, Issue 46, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6463/abaa70

Keywords

quasi-continuous; metasurface; holography; high-efficiency

Funding

  1. National Natural Science Foundation of China [61905031, 61905073, 61905029]
  2. State Key Lab of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences [SKLOTNM-KFKT-201802, KFS2019-1]
  3. Fundamental Research Funds for the Central Universities [2019CDXYGD0028]
  4. State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences

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Metasurfaces have an excellent ability to manipulate an incident electromagnetic wave through single-layer nano-structures, and thus, they have been successfully used to achieve the integration and miniaturization of optical devices. However, most reported metasurfaces achieve the phase/amplitude modulation through discrete antennas, which affect the performances of meta-devices. In this paper, a quasi-continuous metasurface composed of all-dielectric nanostrips with spatially continuous distribution is proposed. A meta-hologram based on quasi-continuous nanostrips is designed, and the broadband and high-efficiency properties of the designed sample are further demonstrated numerically. Compared to discrete structures, this demonstrated scheme can greatly increase the working bandwidth and energy efficiency of the meta-hologram. The quasi-continuous design can also be extended to some other applications that are associated with metasurfaces, such as meta-mirror, meta-lens, Bessel beam, orbital angular momentum generator and so on.

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