Author(s): Huang, C (Huang, Cheng); Sun, B (Sun, Bo); Pan, WB (Pan, Wenbo); Cui, JH (Cui, Jianhua); Wu, XY (Wu, Xiaoyu); Luo, XG (Luo, Xiangang)
Source: SCIENTIFIC REPORTS  Volume: 7  Article Number: 42302  DOI: 10.1038/srep42302  Published: FEB 8 2017 
Abstract: Recently, a concept of digital metamaterials has been proposed to manipulate field distribution through proper spatial mixtures of digital metamaterial bits. Here, we present a design of 2-bit digitally-controlled coding metasurface that can effectively modulate the scattered electromagnetic wave and realize different far-field beams. Each meta-atom of this metasurface integrates two pin diodes, and by tuning their operating states, the metasurface has four phase responses of 0, pi/2, pi, and 3 pi/2, corresponding to four basic digital elements "00", "01", "10", and "11", respectively. By designing the coding sequence of the above digital element array, the reflected beam can be arbitrarily controlled. The proposed 2-bit digital metasurface has been demonstrated to possess capability of achieving beam deflection, multi-beam and beam diffusion, and the dynamical switching of these different scattering patterns is completed by a programmable electric source.
IDS Number: EJ9WA
ISSN: 2045-2322