title: Broadband, wide-angle, low-scattering terahertz wave by a flexible 2-bit coding metasurface.
abstract: Expanding bandwidths and arbitrary control of technology remain key issues in the field of electromagnetic waves, especially in terahertz (THz) wave. In this paper, we propose a novel method to achieve broadband low-scattering THz characteristics with wide-angle and polarization independence by a 2-bit flexible and nonabsorptive coding metasurface. The coding metasurface is composed of four digital elements based on double cross metallic line for "00", "01", "10", and "11." The reflection phase difference of neighboring elements is about 90° over a broad THz frequency band and wide incident angles. The low scattering coefficients below -10 dB were achieved over a wide frequency band from 0.8 THz to 1.5 THz when the incident angle is less than 50° by coding the four elements sequences. This superior property is maintained when the flexible coding metasurface is wrapped around a metallic cylinder with different dimensions. These results present a novel method to control THz waves freely and demonstrate significant scientific value in practical applications.
authors.forename: Xin
authors.initials: X
authors.lastname: Yan
authors.forename: Lanju
authors.initials: L
authors.lastname: Liang
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Liu
authors.forename: Xin
authors.initials: X
authors.lastname: Ding
authors.forename: Degang
authors.initials: D
authors.lastname: Xu
authors.forename: Yating
authors.initials: Y
authors.lastname: Zhang
authors.forename: Tiejun
authors.initials: T
authors.lastname: Cui
authors.forename: Jianquan
authors.initials: J
authors.lastname: Yao