• Chinese Optics Letters
  • Vol. 19, Issue 4, 042602 (2021)
Qiangshi Shi1、2, Xia Jin1, Yangyang Fu3, Qiannan Wu4, Cheng Huang1, Baoyin Sun2、*, Lei Gao2, and Yadong Xu2、**
Author Affiliations
  • 1College of Energy, Soochow University, Suzhou 215006, China
  • 2School of Physical Science and Technology, Soochow University, Suzhou 215006, China
  • 3College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
  • 4School of Science, North University of China, Taiyuan 030051, China
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    Abstract

    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.
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    Qiangshi Shi, Xia Jin, Yangyang Fu, Qiannan Wu, Cheng Huang, Baoyin Sun, Lei Gao, Yadong Xu. Optical beam splitting and asymmetric transmission in bi-layer metagratings[J]. Chinese Optics Letters, 2021, 19(4): 042602
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    Category: Physical Optics
    Received: Aug. 26, 2020
    Accepted: Oct. 19, 2020
    Posted: Feb. 2, 2021
    Published Online: Feb. 22, 2021
    The Author Email: Baoyin Sun (bysun@suda.edu.cn), Yadong Xu (ydxu@suda.edu.cn)