摘要
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 reflectivetype 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 proposed1-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 d B radar cross-section(RCS)reduction can be achieved from 2.1 THz to5.2 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.
作者
Yunping Qi
Baohe Zhang
Jinghui Ding
Ting Zhang
Xiangxian Wang
Zao Yi
祁云平;张宝和;丁京徽;张婷;王向贤;易早(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China;School of Science,Lanzhou University of Technology,Lanzhou 730050,China;Joint Laboratory for Extreme Conditions Matter Properties,Southwest University of Science and Technology,Mianyang 621900,China)
基金
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)
the Scientific Research Fund of Sichuan Provincial Science and Technology Department,China(Grant No.2020YJ0137)。
