Breaking the Diffraction Limit with Radially Polarized Light Based on Dielectric Metalenses,Advanced Optical Materials

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Breaking the Diffraction Limit with Radially Polarized Light Based on Dielectric Metalenses
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-08-26 , DOI: 10.1002/adom.201800795
Ruizhi Zuo ₁ , Wenwei Liu ₁ , Hua Cheng _{1,

2} , Shuqi Chen _{1,

2} , Jianguo Tian _{1,

2}

Affiliation

Dielectric metalenses with high efficiency and compact size have been widely investigated recently, but still suffer from Abbe diffraction limit. Herein, with linear polarization incidence, a dielectric metalens is demonstrated to efficiently generate and focus radially polarized light simultaneously. Two novel methods are proposed to achieve super‐resolution. First, a circular high‐pass aperture is utilized to enhance the longitudinal field component in the vicinity of focus with the focal spot size of 0.138λ², much smaller than the theoretical limit of 0.212λ². The key parameters that impact the focusing size are explored in detail, such as radius of the circular aperture and numerical aperture of the metalens. Second, an extra phase distribution is added on the metalens to filter the transversely polarized component, which leads to a focal spot size of 0.144λ². The approach provides a wide platform for sub‐resolution focusing and imaging, which offers the capability of subdiffraction techniques for microscopy systems and information processing with extensive channels.

中文翻译：

介电金属离子突破了径向偏振光的衍射极限。

近年来，对效率高且尺寸紧凑的介电金属感进行了广泛研究，但是仍然受到阿贝衍射极限的困扰。在此，通过线性偏振入射，证明了介电金属化剂可以有效地同时产生和聚焦径向偏振光。提出了两种新颖的方法来实现超分辨率。首先，一个圆形高通孔被用于提高在焦点附近的纵向电场分量与0.138λ焦斑大小²，比0.212λ理论极限小得多²。详细探讨了影响聚焦尺寸的关键参数，例如圆形光圈的半径和金属化层的数值光圈。其次，额外的相位分布在超透镜加入到过滤横向偏振分量，这导致的0.144λ的焦斑尺寸²。该方法为亚分辨率聚焦和成像提供了广阔的平台，为显微镜系统和具有广泛通道的信息处理提供了亚衍射技术。

更新日期：2018-08-26

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