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-tian1, †,
       

Dispersion curves for the symmetric (solid symbols) and anti-symmetric (hollow symbols) coupled modes of the 3D SIS waveguide for (a) different thicknesses t with g = 0.4 mm and (b) different gap widths g with t = 0.018 mm. The black line is the light line. Here d = 5 mm, a = 0.4d, h = 0.8d, and w = d.