Open AccessBroadband, wide-angle, low-scattering terahertz wave by a flexible 2-bit coding metasurface
Author(s) -
Xin Yan,
Liang Liu,
Jing Yang,
Weiwei Liu,
Xin Ding,
Degang Xu,
Yating Zhang,
Tie Jun Cui,
Jianquan Yao
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.029128
Subject(s) - terahertz radiation , optics , broadband , scattering , physics , polarization (electrochemistry) , electromagnetic radiation , optoelectronics , chemistry
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.