Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

doi:10.1088/1674-1056/abd6fc

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.

Keywords: coding metasurface Pancharatnam-Berry phase multiple beams radar cross-section (RCS) reduction orbital angular momentum

Received: 16 October 2020
Revised: 17 December 2020
Accepted manuscript online: 28 December 2020

PACS:	42.68.Mj	(Scattering, polarization)
	81.05.Xj	(Metamaterials for chiral, bianisotropic and other complex media)
	42.25.Ja	(Polarization)
	78.67.Pt	(Multilayers; superlattices; photonic structures; metamaterials)

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).

Corresponding Authors: ^†Corresponding author. E-mail: qiyunping@nwnu.edu.cn

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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Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

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