Polarization-insensitive unidirectional spoof surface plasmon polaritons coupling by gradient metasurface

Shi Hong-yu¹, Zhang An-xue^{1, 2, †,}, Chen Jian-zhong¹, Wang Jia-fu³, Xia Song⁴, Xu Zhuo⁴

The design of the polarization-insensitive gradient metasurface: (a) the structure of the resonator; (b) the reflective phase of the resonator with different l, and a phase change step of 60° was obtained; (c) the unit cell of the designed gradient metasurface.