A quasi-continuous all-dielectric metasurface for broadband and high-efficiency holographic images
- 29 July 2020
- journal article
- research article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 53 (46), 465105
- https://doi.org/10.1088/1361-6463/abaa70
Abstract
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.Funding Information
- National Natural Science Foundation of China (61905073, 61905029, 61905031)
- Fundamental Research Funds for the Central Universities (2019CDXYGD0028)
- Opening fund from State Key Lab of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences (KFS2019-1, SKLOTNM-KFKT-201802)
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