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...

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用于宽带和高效全息图像的准连续全介电超表面

超表面具有出色的通过单层纳米结构操纵入射电磁波的能力，因此，它们已成功用于实现光学器件的集成和小型化。但是，大多数报道的超颖表面通过离散天线实现相位/幅度调制，这会影响超颖设备的性能。本文提出了一种由具有空间连续分布的全介电纳米带组成的准连续超表面。设计了基于准连续纳米带的亚全息图，并对所设计样品的宽带和高效特性进行了数值模拟。与分立结构相比，该演示方案可以大大提高亚全息图的工作带宽和能效。