Excitation of anti-symmetric coupled spoof SPPs in 3D SIS waveguides based on coupling

Tian Li-li¹, Chen Yang², Liu Jian-long¹, Guo Kai¹, Zhou Ke-ya¹, Gao Yang³, Liu Shu-tian^{1, †,}

(a) The structure sketch of a 3D groove-array waveguide. (b) The 3D SIS waveguide composed of two groove-array waveguides separated by a vacuum gap.