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A complex-amplitude hologram using an ultra-thin dielectric metasurface
Nanoscale ( IF 5.8 ) Pub Date : 2020-11-17 , DOI: 10.1039/d0nr06461k Qiang Jiang 1, 2, 3, 4 , Liangcai Cao 4, 5, 6, 7, 8 , Lingling Huang 1, 2, 3, 4 , Zehao He 4, 5, 6, 7, 8 , Guofan Jin 4, 5, 6, 7, 8
Nanoscale ( IF 5.8 ) Pub Date : 2020-11-17 , DOI: 10.1039/d0nr06461k Qiang Jiang 1, 2, 3, 4 , Liangcai Cao 4, 5, 6, 7, 8 , Lingling Huang 1, 2, 3, 4 , Zehao He 4, 5, 6, 7, 8 , Guofan Jin 4, 5, 6, 7, 8
Affiliation
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Metasurfaces have been widely studied for the arbitrary manipulation of the amplitude, phase and polarization of a field at the subwavelength scale. Holographic images with a high resolution and a large viewing angle can be reconstructed from phase-only holograms encoded in a metasurface. The quality of a holographic image can be greatly improved by using complex-amplitude holograms. However, realizing a high efficiency metasurface with simultaneous and independent control of the amplitude and phase remains a great challenge. In this work, an ultrathin dielectric metasurface which can modulate the complex amplitude in the transmission mode is proposed for a metasurface hologram. The amplitude is controlled by adjusting the dipoles and quadrupoles by tuning the geometric size. The phase value from 0 to 2π is manipulated based on the Pancharatnam–Berry phase (also called the geometric phase) by rotating the meta-atom. The experimental results show that a three-dimensional image reconstructed from a complex-amplitude hologram presents better quality than that from a phase-only hologram. The proposed metasurface shows great potential for applications that require complex amplitude modulation.
中文翻译：
使用超薄介电超表面的复振幅全息图
为了在亚波长范围内对场的幅度，相位和极化进行任意操纵，超表面已经被广泛研究。可以从超表面上编码的仅相位全息图重建高分辨率和大视角的全息图像。通过使用复振幅全息图，可以极大地改善全息图像的质量。然而，在同时且独立地控制振幅和相位的情况下实现高效的超表面仍然是一个巨大的挑战。在这项工作中，提出了一种超薄介电超表面，该超薄介电超表面可以在透射模式下调制复振幅，用于超表面全息图。通过调节几何尺寸来调节偶极和四极来控制幅度。通过旋转超原子，基于Pancharatnam–Berry相（也称为几何相）来控制从0到2π的相位值。实验结果表明，由复振幅全息图重建的三维图像的质量要优于仅相位全息图。所提出的超颖表面对于需要复杂幅度调制的应用显示出巨大的潜力。
更新日期：2020-11-27
中文翻译：
使用超薄介电超表面的复振幅全息图
为了在亚波长范围内对场的幅度，相位和极化进行任意操纵，超表面已经被广泛研究。可以从超表面上编码的仅相位全息图重建高分辨率和大视角的全息图像。通过使用复振幅全息图，可以极大地改善全息图像的质量。然而，在同时且独立地控制振幅和相位的情况下实现高效的超表面仍然是一个巨大的挑战。在这项工作中，提出了一种超薄介电超表面，该超薄介电超表面可以在透射模式下调制复振幅，用于超表面全息图。通过调节几何尺寸来调节偶极和四极来控制幅度。通过旋转超原子，基于Pancharatnam–Berry相（也称为几何相）来控制从0到2π的相位值。实验结果表明，由复振幅全息图重建的三维图像的质量要优于仅相位全息图。所提出的超颖表面对于需要复杂幅度调制的应用显示出巨大的潜力。
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