免偏振敏感消色差超构镜设计研究  

Design of Achromatic Polarization-Insensitive Metalens

作　　者：梁瑜 徐媛媛[1] 邹阳[2] 薛双双 廖景荣 潘文雁 王亚伟[1] Liang Yu;Xu Yuanyuan;Zou Yang;Xue Shuangshuang;Liao Jingrong;Pan Wenyan;Wang Yawei(School of Physics and Electronic Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Jingjiang College,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学物理与电子工程学院,江苏镇江212013 [2]江苏大学京江学院,江苏镇江212013 [3]江苏大学机械工程学院,江苏镇江212013

出　　处：《中国激光》2021年第3期16-24,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(11874184);中国博士后基金(2019M651769);江苏省博士后基金(2018K032A);江苏大学青年英才培训(41119007)。

摘　　要：超构透镜作为一种灵活调控空间光场相位、振幅及偏振的有效选择,在超分显微成像中受到了广泛的关注。为了提高多波长显微成像的分辨率,解决传统光学系统结构厚重、设计复杂等问题,基于相位补偿理论,运用传输相位法以及粒子群优化算法,设计了一种基于二氧化钛纳米单元柱的反射式消色差超构透镜,在500~550 nm之间实现了恒定聚焦,且该透镜具有偏振不敏感的特性。与数值孔径相同但有色散的超构透镜的对比结果有效证实了该超构透镜的消色差功能。所设计的透镜可应用于多波长显微成像系统中并提高成像的分辨率。此外,该消色差透镜在数码相机和光学仪器等领域中也有较好的应用价值。Objective The diffraction-limited phenomenon in optical imaging make the evanescent wave carrying high-order modes of the beam attenuate rapidly when it leaves the object surface,which results in low resolution and affects imaging quality.At the same time,the modulation mechanism from traditional optics makes an optical system highly integrated,which is still difficult.Owing to the miniaturization and flexible control of phase,amplitude,and polarization of the beam,metalenses have been widely used in a variety of highly compact and efficient devices.To overcome dispersion effect caused by the incident light with different frequencies passing through dielectric materials and to reduce the impact on the imaging effect of an optical system in the wideband spectrum,a metalens is designed herein,which achieves constant focus in the visible light band from 500 nm to 550 nm based on the titanium dioxide unit nanopillar.At the same time,to reduce the energy loss caused by the introduction of a polarizer in the traditional optical system,the achromatic metalens is introduced,which has also polarization-insensitive characteristics.The lens improves the imaging resolution of a multi-wavelength microscopy imaging system and has good applicability in the fields of digital cameras and optical instruments.Methods Based on the phase compensation theory,the transmission phase method and the particle swarm optimization algorithm are used in this paper to design an achromatic metalens,and the first and higher derivative terms of the incident light phase information can make the incident light with different wavelengths arrive at the same time.In the same focal plane,to achieve this goal,the unit structure that meets this condition is selected.Usually,the geometric phase method is used for designing with polarization sensitivity.To satisfy the polarization insensitivity of the metalens on the basis of achromatic aberration and ensure both linearly polarized light and circularly polarized light to be incident,square nanopillars are s

关 键 词：光学设计 光学材料 超构透镜 消色差透镜 免偏振敏感 多波长 显微成像 

分 类 号：O436[机械工程—光学工程]