| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces |
| Yunping Qi(祁云平)1,† Baohe Zhang(张宝和)1, Jinghui Ding(丁京徽)1, Ting Zhang(张婷)1, Xiangxian Wang(王向贤)2, and Zao Yi(易早)3 |
| 1 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China; 2 School of Science, Lanzhou University of Technology, Lanzhou 730050, China; 3 Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621900, China |
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Abstract Benefiting from the unprecedented superiority of coding metasurfaces at manipulating electromagnetic waves in the microwave band, in this paper, we use the Pancharatnam-Berry (PB) phase concept to propose a high-efficiency reflective-type coding metasurface that can arbitrarily manipulate the scattering pattern of terahertz waves and implement many novel functionalities. By optimizing the coding sequences, we demonstrate that the designed 1-, 2-, and 3-bit coding metasurfaces with specific coding sequences have the strong ability to control reflected terahertz waves. The two proposed 1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily controlled. For normally incident x-and y-polarized waves, a 10 dB radar cross-section (RCS) reduction can be achieved from 2.1 THz to 5.2 THz using the designed 2-bit coding metasurface. Moreover, two kinds of orbital angular momentum (OAM) vortex beams with different moduli are generated by a coding metasurface using different coding sequences. Our research provides a new degree of freedom for the sophisticated manipulation of terahertz waves, and contributes to the development of metasurfaces towards practical applications.
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Received: 16 October 2020
Revised: 17 December 2020
Accepted manuscript online: 28 December 2020
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PACS:
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42.68.Mj
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(Scattering, polarization)
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81.05.Xj
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(Metamaterials for chiral, bianisotropic and other complex media)
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42.25.Ja
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(Polarization)
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61865008), Northwest Normal University Young Teachers' Scientific Research Capability Upgrading Program (Grant No. NWNU-LKQN2020-11), and the Scientific Research Fund of Sichuan Provincial Science and Technology Department, China (Grant No. 2020YJ0137). |
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Corresponding Authors:
†Corresponding author. E-mail: qiyunping@nwnu.edu.cn
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Cite this article:
Yunping Qi(祁云平) Baohe Zhang(张宝和), Jinghui Ding(丁京徽), Ting Zhang(张婷), Xiangxian Wang(王向贤), and Zao Yi(易早) Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces 2021 Chin. Phys. B 30 024211
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