Sub-wavelength focusing based on all-dielectric polarization-independent metalens

被引：3
|
作者：
Zhao, Wei [1 ,2 ]
Li, Xingyi [1 ,3 ]
Li, Siqi [1 ,3 ]
Ge, Zhiqiang [1 ,3 ]
Liu, Mulong [1 ,3 ]
Li, Zhongyu [1 ,3 ]
Du, Shujian [1 ,3 ]
机构：
[1] Chinese Acad Sci, XIOPM, State Key Lab Transient Opt & Photon, Xian 710119, Shaanxi, Peoples R China
[2] Shaanxi Normal Univ, Coll Phys & Informat Technol, Xian 710119, Shanxi, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2018年 / 32卷 / 29期
关键词：
Lenses; metamaterials; polarization; BROAD-BAND; ULTRA-THIN; REFLECTION; OPTICS; PLANAR;
D O I：
10.1142/S0217979218503216
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have proposed an all-dielectric polarization-independent metalens, which can be used for sub-wavelength focusing. The phase discontinuity of transmission light is produced by varying the diameter of the nanopillar. In this way, the incident light can be focused into sub-wavelength spot. Besides, finite-difference time-domain results show that near diffraction limit focusing is realized for the wavelength from 580 nm to 750 nm, which means the proposed metalens possesses a broad operation bandwidth. This all-dielectric metalens features polarization independent and broad bandwidth, and thus promises great potential for the applications of nanolithography, dense storage and biophotonics.
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页数：8
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