摘要
In this work, inspired by advances in twisted two-dimensional materials, we design and study a new type of optical bi-layer metasurface system, which is based on subwavelength metal slit arrays with phase-gradient modulation, referred to as metagratings(MGs). It is shown that due to the found reversed diffraction law, the interlayer interaction that can be simply adjusted by the gap size can produce a transition from optical beam splitting to high-efficiency asymmetric transmission of incident light from two opposite directions. Our results provide new physics and some advantages for designing subwavelength optical devices to realize efficient wavefront manipulation and one-way propagation.
作者
Qiangshi Shi
Xia Jin
Yangyang Fu
Qiannan Wu
Cheng Huang
Baoyin Sun
Lei Gao
Yadong Xu
施强石;金霞;伏洋洋;吴倩楠;黄程;孙宝印;高雷;徐亚东(College of Energy,Soochow University,Suzhou 215006,China;School of Physical Science and Technology,Soochow University,Suzhou 215006,China;College of Science,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;School of Science,North University of China,Taiyuan 030051,China)
基金
supported by the National Natural Science Foundation of China (Nos. 11974010, 11904169, 61705200, 11604229, and 11774252)
the Natural Science Foundation of Jiangsu Province (Nos. BK20171206 and BK20190383)
the China Postdoctoral Science Foundation (No. 2018T110540)
the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions。
