首页|Metalens with tilted structures for high-efficiency focusing at large-angle incidences

Metalens with tilted structures for high-efficiency focusing at large-angle incidences

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The metalens has attracted remarkable attention due to its ultra-thin and ultra-light characteristics,which indicate great potential for compact imaging.However,the limited efficiency at a large angle incidence severely hinders the application of wide-angle focusing and imaging,which is pursued in the fast-developing imaging systems.Therefore,new strategies to improve the lens performance at large incident angles are in demand.In this work,we propose tilted structures for large-angle focusing with improved efficiency.Metalenses based on dynamic phase and geometric phase are designed and sys-tematically characterized by numerical simulations.We show that tilted structures of unit cells significantly improve the lens performance at oblique incidences.In detail,the focusing efficiency of the metalens with tilted structures is increased over 25％at 30° incidence,as well as the modulation transfer function.In addition,we develop a hybrid metalens array achieving highly efficient wide-angle imaging up to 120°.We believe this design provides a feasible route toward wide-field and high-performance imaging applications.

metalensestilted structureslarge-angle incidencehigh efficiency

王月、陈晨、吴圣杰、叶欣、祝世宁、李涛

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National Laboratory of Solid State Microstructures,Key Laboratory of Intelligent Optical Sensing and Manipulations,Jiangsu Key Laboratory of Artificial Functional Materials,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2022YFA140430162325504623051499225030462288101

2024

10.3788/COL202422.053601

中国光学快报(英文版)
中国光学学会 中国科学院上海光学精密机械研究所

中国光学快报(英文版)

CSTPCD
影响因子：1.305
ISSN：1671-7694
年,卷(期)：2024.22(5)