Anisotropic metasurface with high-efficiency reflection and transmission for dual-polarization
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Anisotropic metasurface with high‑efficiency reflection and transmission for dual‑polarization Lei Chen1 · Qian Fan Nie1 · Ying Ruan1 · Hao Yang Cui1 Received: 13 June 2020 / Accepted: 26 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Recently, accelerating advances in coding metasurfaces linking metamaterial and digital codes have enabled unexampled route for electromagnetic (EM) waves manipulation, including perfect reflection and transmission. In this paper, an anisotropic coding metasurface with a semi-discontinuous metallic ground sheet are proposed, which realizes dual independent functionalities by changing the polarization of incident waves. The ultrathin metasurface is composed of eight coding elements based on a simple rectangle metal patch and the reflective phases of these elements fully cover 360°. Both numerical and measured results show that our design is able to near-perfectly reflect the normally incident y-polarized wave to desired reflection angle and transmit the y-polarized plane wave with high efficiency. In addition, considering the simple structure, easy fabrication process and decent control ability on EM waves, the proposed coding metasurface may be exploited for more complex functionalities. Keywords Coding metasurface · Perfect reflection · Anisotropic · Dual-polarization
1 Introduction Metamaterials, one type of three-dimensional artificial structures, possess exceptional electromagnetic characteristic not found in nature. By engineering the structures deliberately, metamaterials enable the extraordinary responses to electromagnetic (EM) waves and device functionalities. Consequently, considerable interest in metamaterials gives rise to plentiful intriguing phenomena such as negative index of refraction [1, 2], optical imaging [3, 4] and electromagnetic invisibility [5, 6]. However, due to the high losses and difficult fabrications of 3D structures, researchers come to focus on metasurfaces which are termed as two-dimensional (2D) version of metamaterials. In general, metasurfaces composed of spatially diverse elements and introduce abrupt phase changes [7, 8]. Therefore, metasurfaces provide an unprecedented route to control the amplitudes [9, 10], phases [11, 12], and polarization states [13] of EM waves. Instead of utilizing effective medium parameters, the conception of * Hao Yang Cui [email protected] 1
College of Electronics and Information Engineering, Shanghai University of Electric Power, No.2588 Changyang Road, Yangpu District, Shanghai, China
the coding metamaterials [14] has been introduced recently, in which metamaterials can be digitally controlled to achieve distinct functionalities. The coding metamaterials are characterized by different unit cells with digital states. For a 1-bit metamaterial, two elements with opposite phase responses are encoded as “0” and “1”. By arraying these elements with discrete phases, the coding metamaterials demonstrate a powerful capability to manipulate EM waves, such as anomalous reflections [15
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