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Angle-multiplexed optically encrypted metasurfaces fabricated by ultrafast laser induced spatially selective-modified nanograting structures

ZHANG Xiao-bin HAN Wei-na

张晓斌, 韩伟娜. 角度复用的光学加密超表面的超快激光嵌套加工方法研究[J]. 中国光学(中英文), 2023, 16(4): 889-903. doi: 10.37188/CO.2022-0228
引用本文: 张晓斌, 韩伟娜. 角度复用的光学加密超表面的超快激光嵌套加工方法研究[J]. 中国光学(中英文), 2023, 16(4): 889-903. doi: 10.37188/CO.2022-0228
ZHANG Xiao-bin, HAN Wei-na. Angle-multiplexed optically encrypted metasurfaces fabricated by ultrafast laser induced spatially selective-modified nanograting structures[J]. Chinese Optics, 2023, 16(4): 889-903. doi: 10.37188/CO.2022-0228
Citation: ZHANG Xiao-bin, HAN Wei-na. Angle-multiplexed optically encrypted metasurfaces fabricated by ultrafast laser induced spatially selective-modified nanograting structures[J]. Chinese Optics, 2023, 16(4): 889-903. doi: 10.37188/CO.2022-0228

角度复用的光学加密超表面的超快激光嵌套加工方法研究

详细信息
  • 中图分类号: TP394.1;TH691.9

Angle-multiplexed optically encrypted metasurfaces fabricated by ultrafast laser induced spatially selective-modified nanograting structures

doi: 10.37188/CO.2022-0228
Funds: Supported by National Key R & D Program of China (No. 2022YFB4602900); Chongqing Natural Science Foundation of China (No. cstc2021jcyj-cxttX0003, No. CSTB2022NSCQ-MSX1322); National Natural Science Foundation of China (NSFC) (No. 52005041, No. 52235009)
More Information
    Author Bio:

    ZHANG Xiao-bin (1998—), male, born in Jinzhong, Shanxi, master's degree. He obtained his bachelor's degree from Central South University in 2020 and mainly engages in research in micro-nano manufacturing and pump probe. E-mail: 3120200434@bit.edu.cn

    HAN Wei-na (1988—), female, PhD, Associate Researcher and Master's Supervisor at the Institute of Laser Micro-Nano Manufacturing at Beijing Institute of Technology, mainly engages in research on ultra-fast laser micro-nano manufacturing and reconfigurable photonic device processing. E-mail: hanwn@bit.edu.cn

    Corresponding author: hanwn@bit.edu.cn
  • 摘要:

    图案信息的光学加密在防伪、信息加密存储等方面具有广泛的应用,基于各向异性功能复用的结构色超表面得到发展。基于一维光栅衍射的光学加密超表面由于需要逐个加工掩模或单元结构,从而导致效率低下;传统激光烧蚀波纹结构(LIPSS)效率高,但所形成的结构均匀、一致性差。基于以上难题,提出了一种基于皮秒激光直写相变材料Ge2Sb2Te5得到的改性结构加工光学超表面的方法。首先,表征所制备的GST改性光栅的色散性能,结合改性光栅的偏振依赖性,设计了角度复用的信息加密超表面。实现了在自然光条件下加密,在强光条件下能够选择性解密读取并动态展示的性能。相比于传统加工方法,本方法可在一次直写过程中以同时打印的形式生成一系列光栅结构,提高了加工效率;同时加工得到的光栅结构均匀一致性好,提高了显色效果。利用取向角相差16°的改性光栅实现了无串扰的选择性信息读取,所得结构色均匀鲜艳。本文提出的加工策略在防伪、信息加密存储及可穿戴柔性显示设备等领域有深刻的应用前景。

     

  • 图 1  信息加密超表面的设计图。(a)激光直写后GST的性质变化;(b)激光直写GST的三种特征结构对应加工图案;(c)信息加密超表面分别在自然光和强光下的效果

    Figure 1.  Schematic diagram of an information-encrypting metasurface. (a) The properties of GST after direct laser writing; (b) the three characteristic structures of laser direct writing GST correspond to the processing patterns; (c) the effect of the information encryption metasurface under natural light and strong light, respectively

    图 2  改性光栅结构的表征。(a)100倍光镜下的改性光栅;(b)(c)改性光栅的SEM图;(d)改性光栅的AFM结果;(e)对应图(d)的曲线图

    Figure 2.  Characterization of modified grating structures. (a) Modified grating under 100× optical microscope; (b)(c) SEM image of modified grating; (d) AFM results of modified grating; (e) the graph corresponding to (d)

    图 3  GST 改性光栅色散特性的表征。(a)偏振与改性结构之间的关系;(b)−(e)分别在 0°、10°、30° 和 40° 激光偏振条件下的改性结构; (f)用于表征色散能力的装置示意图;(g)−(i)RGB色彩的实拍展示;(j)拍照所获得的不同角度下的色散结果

    Figure 3.  Characterization of the dispersion properties of GST-modified gratings. (a) Relationship between polarization and modified structure; (b)−(e) modified structure under laser polarization conditions of 0°, 10°, 30°, and 40°, respectively; (f) schematic diagram of the device used to characterize the dispersion capability; (g)−(i) real shot display of RGB color; (j) the dispersion results obtained at different angles

    图 4  嵌套加工的信息加密超表面。(a)器件表面三种不同的改性结构排布方式的设计图;(b)自然光条件下加工区域的照片;(c), (d)嵌套区域和背景区域的光学显微镜图像;(e)不同视角解码的图案信息

    Figure 4.  Information encryption metasurfaces for nested processing. (a) Design diagrams of three different modified structure arrangements on the device surface. (b) Photograph of the processed area under natural light conditions. (c) and (d) are optical microscopy images of the nested and background regions, respectively. (e) Pattern information decoded from different views

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出版历程
  • 收稿日期:  2022-11-07
  • 修回日期:  2022-11-25
  • 录用日期:  2023-03-08
  • 网络出版日期:  2023-03-08

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