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Polarization-independent broadband meta-holograms via polarization-dependent nanoholes†
Nanoscale ( IF 6.7 ) Pub Date : 2018-04-16 00:00:00 , DOI: 10.1039/c7nr08428e
Xiaohu Zhang 1, 2, 3, 4, 5 , Xiong Li 1, 2, 3, 4, 5 , Jinjin Jin 1, 2, 3, 4, 5 , Mingbo Pu 1, 2, 3, 4, 5 , Xiaoliang Ma 1, 2, 3, 4, 5 , Jun Luo 1, 2, 3, 4, 5 , Yinghui Guo 1, 2, 3, 4, 5 , Changtao Wang 1, 2, 3, 4, 5 , Xiangang Luo 1, 2, 3, 4, 5
Affiliation  

Composed of ultrathin metal or dielectric nanostructures, metasurfaces can manipulate the phase, amplitude and polarization of electromagnetic waves at a subwavelength scale, which is promising for flat optical devices. In general, metasurfaces composed of space-variant anisotropic units are sensitive to the incident polarization due to the inherent polarization dependent geometric phase. Here, we implement polarization-independent broadband metasurface holograms constructed by polarization-dependent anisotropic elliptical nanoholes by elaborate design of complex amplitude holograms. The fabricated meta-hologram exhibits a polarization insensitive feature with an acceptable image quality. We verify the feasibility of the design algorithm for three-dimensional (3D) meta-holograms with simulation and the feasibility for two-dimensional (2D) meta-holograms is experimentally demonstrated at a broadband wavelength range from 405 nm to 632.8 nm. The effective polarization-independent broadband complex wavefront control with anisotropic elliptical nanoholes proposed in this paper greatly promotes the practical applications of the metasurface in technologies associated with wavefront manipulation, such as flat lens, colorful holographic displays and optical storage.

中文翻译:

通过偏振相关的纳米孔实现与 偏振无关的宽带亚全息图

由超薄金属或电介质纳米结构组成的超颖表面可以在亚波长范围内控制电磁波的相位,幅度和极化,这对于平面光学器件很有希望。通常,由于固有的偏振相关的几何相位,由空间变化的各向异性单元组成的超表面对入射偏振敏感。在这里,我们通过复杂幅度全息图的精心设计,实现了由偏振相关的各向异性椭圆形纳米孔构成的偏振无关的宽带超表面全息图。所制造的亚全息图具有对偏振不敏感的特征,并且具有可接受的图像质量。我们通过仿真验证了三维(3D)元全息图设计算法的可行性,并在405 nm至632.8 nm的宽带波长范围内通过实验证明了二维(2D)元全息图的可行性。本文提出的具有各向异性椭圆纳米孔的有效的与偏振无关的宽带复杂波前控制,极大地促进了超表面在与波前操纵相关的技术中的实际应用,例如平板透镜,彩色全息显示器和光学存储。
更新日期:2018-04-16
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