摘要
本文利用准连续纳米带组成的超表面设计了一种光学微分器件,并实现了对光学图像的一维边缘检测。该器件通过改变准连续纳米带的空间取向实现0~2π的几何相位调控,且能在较宽的波段范围内保持较高的能量效率。仿真结果表明,当照明波长从400 nm增加至1000 nm时,该准连续器件均能实现清晰的边缘检测效果。其能量效率最高为90.27%(600 nm波长处),平均能量效率为64.57%(400 nm~1000 nm)。可以预期,本文所提方法能促进准连续超表面在图像信息处理、超快光学模拟计算等方面的应用。
In this paper,we design an optical differential device based on quasi-continuous metasurface and realize one-dimensional edge detection of an optical image.By changing the spatial orientation of quasi-continuous nanostrips,the device achieves geometric phase in the range of 0~2π,and maintains high energy efficiency over a wide wavelength range.The simulation results show that when the illumination wavelength increases from 400 nm to 1000 nm,the quasi-continuous meta-device can achieve clear images for the target edge.The maximum energy efficiency is 90.27%(the incident wavelength is 600 nm)and the average energy efficiency is 64.57%(the incident wavelength changes from 400 nm to 1000 nm).It can be expected that the proposed method can promote the application of quasi-continuous metasurface in image information processing and ultrafast optical computation.
作者
张海漠
杨阳
刘开峰
施林彤
贺梦瑶
张晓虎
Zhang Haimo;Yang Yang;Liu Kaifeng;Shi Lintong;He Mengyao;Zhang Xiaohu(College of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China;Key Laboratory of Optoelectronic Technology and Systems Ministry of Education,Chongqing University,Chongqing 400044,China)
出处
《光电工程》
CAS
CSCD
北大核心
2022年第10期89-96,共8页
Opto-Electronic Engineering
基金
国家重点研发计划资助项目(2020YFC1522900)
国家自然科学基金资助项目(61905031)。
关键词
准连续
超表面
宽带
高效率
边缘检测
quasi-continuous
metasurface
broadband
high-efficiency
edge detection
