Polarization-insensitive unidirectional spoof surface plasmon polaritons coupling by gradient metasurface
Shi Hong-yu1, Zhang An-xue1, 2, †, , Chen Jian-zhong1, Wang Jia-fu3, Xia Song4, Xu Zhuo4
       

(a) The y component of the total electric field. (b) The x component of the total magnetic field. (c) The z component of the total magnetic field in the xz plane. (d) The total power flow in the xz plane at 5.09 GHz under normal-polarized incidence. (e) The z component of the total magnetic field in the xy plane at z = 5 mm, where 12p = 2λsspp = 1.6λ0.