High focusing efficiency in subdiffraction focusing metalens

Nanophotonics

article

Ze-Peng Zhuang¹  Rui Chen¹  Zhi-Bin Fan¹  Xiao-Ning Pang¹  Jian-Wen Dong¹ 

[1] School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University

关键词: metalens;    subdiffraction focusing;    vector beam;    optimization;   

DOI  :  10.1515/nanoph-2019-0115

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Vector beams with phase modulation in a high numerical aperture system are able to break through the diffraction limit. However, the implementation of such a device requires a combination of several discrete bulky optical elements, increasing its complexity and possibility of the optical loss. Dielectric metalens, an ultrathin and planar nanostructure, has a potential to replace bulky optical elements, but its optimization with full-wave simulations is time-consuming. In this paper, an accurate and efficient theoretical model of planar metalens is developed. Based on this model, a twofold optimization scheme is proposed for optimizing the phase profile of metalenses so as to achieve subdiffraction focusing with high focusing efficiency. Then, a metalens that enables to simultaneously generate radially polarized beam (RPB) and modulate its phase under the incidence of x -polarized light with the wavelength of 532 nm is designed. Full-wave simulations show that the designed metalens of NA = 0.95 can achieve subdiffraction focusing (FWHM = 0.429λ) with high transmission efficiency (77.6%) and focusing efficiency (17.2%). Additionally, superoscillation phenomenon is found, leading to a compromise between the subdiffraction spot and high efficiency. The proposed method may provide an accurate and efficient way to achieve sub-wavelength imaging with the expected performances, which shows a potential application in super-resolution imaging.

【 授权许可】

CC BY