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  • Received: Mar. 16, 2020

    Accepted: Apr. 30, 2020

    Posted: Jun. 15, 2020

    Published Online: Jun. 16, 2020

    The Author Email: Jianwen Dong (dongjwen@mail.sysu.edu.cn)

    DOI: 10.3788/COL202018.073601

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    Weiyi Shi, Weimin Deng, Weinan Liu, Zepeng Zhuang, Zhibin Fan, Jianwen Dong. Rectangular dielectric metagrating for high-efficiency diffraction with large-angle deflection[J]. Chinese Optics Letters, 2020, 18(7): 073601

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Chinese Optics Letters, Vol. 18, Issue 7, 073601 (2020)

Rectangular dielectric metagrating for high-efficiency diffraction with large-angle deflection 

Weiyi Shi, Weimin Deng, Weinan Liu, Zepeng Zhuang, Zhibin Fan, and Jianwen Dong*

Author Affiliations

  • School of Physics & State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China

Abstract

In this Letter, we propose a metagrating consisting of simple rectangular bars for nearly unity anomalous diffraction with a large deflection angle. The analysis performed by the scattering-matrix method shows that such exceptional beam steering derives from the couplings of the two lowest propagation waveguide-array-modes and their constructive interferences. The tolerance of the incident angle for a high diffraction efficiency (e.g., >90%) is within a range of 33°. We also discuss that such an advantage still exists after considering a reasonable loss and dispersion. We envision that the proposed strategy may have wide use in the field of high-performance wavefront-shaping applications.

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