摘要
全息光学是近代光学领域的一个重要分支。全息技术充分利用完整的电磁场振幅和位相信息实现对电磁场的重构。近些年来发展起来的计算全息技术通过电磁算法来计算得到包含振幅和位相信息的全息图，在外界光源的照射下可以产生预先设计的、虚拟的物体图像。现有的基于二元光学元件或空间光调制器等实现的位相型计算全息图，通常存在像元尺寸大和位相调控能力有限等限制，使得全息的视场角受限，难以实现大视场三维彩色全息。
As nanofabrication technology progresses, the emerging metasurface has offered unique opportunities for holography, such as an increased data capacity and the realization of polarization-sensitive functionality. Multicolor three-dimensional (3D) meta-hologram imaging is one of themost pursued applications for meta-hologram not yet realized. How to reduce the cross-talk among different colors in broad bandwidth designs is a critical question. On the basis of the off-axis illumination method, we develop a novel way to overcome the cross-talk limitation and achieve multicolor meta-holography with a single type of plasmonic pixel. With this method, the usable data capacity can also be improved. It not only leads to a remarkable image quality, with a signal-to-noise ratio (SNR) five times better than that of the previousmeta-hologram designs, but also paves the way to new meta-hologramdevices, which mark an advance in the field of meta-holography. For example, a seven-color meta-hologram can be fabricated with a color gamut 1.39 times larger than that of the red, green, and blue (RGB) design. For the first time, a full-color meta-holographic image in the 3D space is also experimentally demonstrated. Our approach to expanding the information capacity of the meta-hologram is unique, which extends broad applications in data storage, security, and authentication.
作者
Li, Xiong
Chen, Lianwei
Li, Yang
Zhang, Xiaohu
Pu, Mingbo
Zhao, Zeyu
Ma, Xiaoliang
Wang, Yanqin
Hong, Minghui
Luo, Xiangang
出处
《光电工程》
CAS
CSCD
北大核心
2017年第1期2-2,共1页
Opto-Electronic Engineering
