摘要
提出并设计一种基于Pancharatnam-Berry(P-B)相位超表面的二维光学微分器,并实现对光学图像的二维光学边缘检测.在环形光栅相位的作用下,该P-B相位超表面可将光束的左右旋分量在径向进行分离,在滤除中间重叠部分的线偏振光后,保留下来的光学信息即为二维光学微分结果.同时,通过调节该二维光学微分器的光轴分布函数可对边缘信息分辨率进行灵活调控.研究结果表明,上述P-B相位超表面可用于光学图像的二维边缘信息提取,相比于一维光栅式超表面,该方法得到的边缘信息更加完整、清晰.可以预期,这种二维光学微分器在超快光学计算与光学图像处理等方面具有重要的潜在应用价值.
With the rapid development of metasurface and metamaterials,the image edge detection based on the optical spatial differential calculation becomes an interesting topic in recent years.There have been a certain number of studies in this region,but most of them are applicable only to one-dimensional optical spatial differential calculation.In this work,a two-dimensional optical differentiator using Pancharatnam-Berry(P-B)phase metasurface is proposed and implemented in optical image two-dimensional edge detection.Based on the principle of the spin-dependent splitting from P-B phase devices,this metasurface is capable of separating the left-handed circularly polarized light from the right-handed circularly polarized light at a certain spatial distance.After filtering out the overlapped linear polarization,the left optical information is the result of the two-dimensional optical spatial differential.Meanwhile,the resolution of the image edge information is adjustable by changing the optic axis distribution of this two-dimensional optical differentiator.These results indicate that our P-B phase metasurface can be applied to the extraction of the optical image two-dimensional edge information,and the extracted edge information is more complete than the previous one-dimensional grating metasurface.For these advantages,this two-dimensional optical differentiator shows great potential applications in ultrafast optical calculation and image processing.
作者
谢智强
贺炎亮
王佩佩
苏明样
陈学钰
杨博
刘俊敏
周新星
李瑛
陈书青
范滇元
Xie Zhi-Qiang;He Yan-Liang;Wang Pei-Pei;Su Ming-Yang;Chen Xue-Yu;Yang Bo;Liu Jun-Min;Zhou Xin-Xing;Li Ying;Chen Shu-Qing;Fan Dian-Yuan(International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology,and Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province,Shenzhen University,Shenzhen 518060,China;College of New Materials and New Energies,Shenzhen Technology University,Shenzhen 518118,China;Synergetic Innovation Center for Quantum Effects and Applications,School of Physics and Electronics,Hunan Normal University,Changsha 410081,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第1期217-225,共9页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61805149,61575127)
广东自然科学基金(批准号:2016A030310065)
广东省教育委员会(批准号:2016KCXTD006)
深圳市科技计划基础研究项目(批准号:JCYJ20180507182035270)
深圳市科技项目(批准号:ZDSYS201707271014468)
深圳大学二维材料光电科技国际合作联合实验室基金(批准号:2DMOST2018003)资助的课题~~
