State Key Lab of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu, 610209, China.
Nanoscale. 2017 Jan 26;9(4):1409-1415. doi: 10.1039/c6nr07854k.
For the miniaturization of optical holographic and data recording devices, large information capacity or data density is indispensable but difficult to obtain using traditional technologies. In this paper, an ultrahigh-capacity metasurface hologram is proposed by encoding information in deep-subwavelength scale nanohole arrays, which can be reconstructed via a light beam with proper designed incident angles. The imaging information capacity of the two-dimensional (2D) hologram, defined by the distortion-free region, can be increased 11.5 times, which is experimentally demonstrated by focused ion beam (FIB) milling of an ultrathin metallic film. We also prove the feasibility of a three-dimensional (3D) hologram of spiral lines designed by using the point source algorithm. Benefitting from the ultrahigh capacity of the deep-subwavelength metasurface, dynamic holographic displays can be realized by controlling the incident angle. The method proposed here can also be leveraged to achieve large capacity optical storage, colorful holographic displays, lithography technology etc.
为实现光学全息和数据记录设备的小型化，超大信息容量或数据密度是必不可少的，但使用传统技术很难实现。本文提出了一种基于超材料的超高容量全息图，通过在亚波长尺度纳米孔阵列中编码信息来实现，通过适当设计入射角的光束可以对其进行重建。二维（2D）全息图的成像信息容量（由无失真区域定义）可以增加 11.5 倍，这通过聚焦离子束（FIB）铣削超薄金属薄膜得到了实验验证。我们还通过使用点源算法设计的螺旋线证明了三维（3D）全息图的可行性。受益于超材料的超高容量，通过控制入射角可以实现动态全息显示。本文提出的方法还可以用于实现大容量光存储、彩色全息显示、光刻技术等。
