Visible frequency broadband dielectric metahologram by random Fourier phase-only encoding
Visible frequency broadband dielectric metahologram by random Fourier phase-only encoding
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DOI：
10.1007/s11433-020-1574-1
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
Xuyue Guo;Peng Li;Bingjie Li;Sheng Liu;Bingyan Wei;Weiwei Zhu;Jinzhan Zhong;Shuxia Qi;Jianlin Zhao
中科院分区：
文献类型：
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作者：
Xuyue Guo;Peng Li;Bingjie Li;Sheng Liu;Bingyan Wei;Weiwei Zhu;Jinzhan Zhong;Shuxia Qi;Jianlin Zhao
近年来，能够实现亚波长尺度波前灵活调制的超表面由于其在偏振自由度、视角和消色差等方面的显著优势而被广泛应用于全息显示中。在全息照相中，全息图的计算复杂度、成像清晰度、能量利用率、再现率和系统间接性都由编码方法决定。本文提出了一种基于随机傅里叶纯相位编码方法的可见频率宽带介质元全息图。利用这种简便的方法，我们设计并制作了透射型几何相位全介质元全息图，在可见光范围内实现了高质量的全息显示。该方法只需一次将振幅信息编码到相位函数中，省去了繁琐的迭代过程，大大简化了计算过程，有利于大面积纳米印刷全息图的制备。
In recent years, metasurfaces that enable the flexible wavefront modulation at sub-wavelength scale have been widely used into holographic display, due to its prominent advantages in polarization degrees of freedom, viewing angle, and achromaticity in comparison with traditional holographic devices. In holography, the computational complexity of hologram, imaging sharpness, energy utilization, reproduction rate, and system indirection are all determined by the encoding method. Here, we propose a visible frequency broadband dielectric metahologram based on the random Fourier phase-only encoding method. Using this simple and convenient method, we design and fabricate a transmission-type geometric phase all-dielectric metahologram, which can realize holographic display with high quality in the visible frequency range. This method encodes the amplitude information into the phase function only once, eliminating the cumbersome iterations, which greatly simplifies the calculation process, and may facilitate the preparation of large area nanoprint-holograms.