title: Broadband diffuse terahertz wave scattering by flexible metasurface with randomized phase distribution.
abstract: Suppressing specular electromagnetic wave reflection or backward radar cross section is important and of broad interests in practical electromagnetic engineering. Here, we present a scheme to achieve broadband backward scattering reduction through diffuse terahertz wave reflection by a flexible metasurface. The diffuse scattering of terahertz wave is caused by the randomized reflection phase distribution on the metasurface, which consists of meta-particles of differently sized metallic patches arranged on top of a grounded polyimide substrate simply through a certain computer generated pseudorandom sequence. Both numerical simulations and experimental results demonstrate the ultralow specular reflection over a broad frequency band and wide angle of incidence due to the re-distribution of the incident energy into various directions. The diffuse scattering property is also polarization insensitive and can be well preserved when the flexible metasurface is conformably wrapped on a curved reflective object. The proposed design opens up a new route for specular reflection suppression, and may be applicable in stealth and other technology in the terahertz spectrum.
authors.affiliation: Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Lanju
authors.initials: L
authors.lastname: Liang
authors.affiliation: Institute of Modern Optics, Nankai University, Tianjin 300071, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.affiliation: Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Yijun
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhu
authors.affiliation: Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Junming
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Tian
authors.initials: T
authors.lastname: Jiang
authors.affiliation: Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Biaobing
authors.initials: B
authors.lastname: Jin
authors.affiliation: Institute of Modern Optics, Nankai University, Tianjin 300071, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Liu