摘要
本文提出了一种在不借助4f成像系统的情况下实现可切换边缘检测与聚焦成像的超表面。超表面由相变材料(Ge_(2)Sb_(2)Se_(4)Te_(1),GSST)方柱和硅(Si)基底组成的单元结构周期性排列而成。其不同功能的实现来源于GSST处于非晶态和晶态下所提供的不同传输相位与几何相位的优化组合。当GSST处于非晶态和晶态下,单元结构平均交叉偏振透射系数分别在0.77和0.42以上。为了验证设计的可行性,本文对所设计的可切换超表面在晶态和非晶态下分别进行了仿真与理论计算,表现出优异的成像与边缘检测效果。所提出的超表面及其工作原理在生物医学成像和缺陷检测等领域有潜在应用价值。
A versatile metasurface platform based on phase change materials(PCMs)is provided to realize dynamic switching between edge detection and imaging without the assistance of a 4f imaging system.The metasurface consists of a periodic arrangement of unit structures which consists of a Ge_(2)Sb_(2)Se_(4)Te_(1)(GSST)nanofin on a silicon substrate.The dynamically switchable performance results from the combination of the geometric phase and two independent propagation phases that are provided by the composed phase-change material metaatoms in amorphous and crystalline states.The average cross-polarized transmission coefficients are 0.77 and 0.42 in the amorphous and crystalline states.In order to verify the feasibility of the design,simulation and theoretical calculation of the designed switchable metasurface are carried out in crystalline state and amorphous state respectively,which show excellent imaging and edge detection results.The proposed metasurface and its working principle have potential applications in biomedical imaging and defect detection.ect detection.
作者
胡杰
唐紫依
蓝翔
邓钦荣
张汶婷
黄奕嘉
李玲
Hu Jie;Tang Ziyi;Lan Xiang;Deng Qinrong;Zhang Wenting;Huang Yijia;Li Ling(Laboratory of Micro-Nano Optics,College of Physics and Electronic Engineering,Sichuan Normal University,Chengdu,Sichuan 610101,China)
出处
《光电工程》
CAS
CSCD
北大核心
2023年第8期99-108,共10页
Opto-Electronic Engineering
基金
国家自然科学基金资助项目(62105228)
四川省自然科学基金资助项目(2022NSFSC2000)。
关键词
边缘检测
聚焦成像
相变材料
超表面
edge detection
imaging
phase change material
metasurface
