Analysis of the Symmetric and Anti-Symmetric Modes in Spoof-Insulator-Spoof Waveguides

作者：Yang, Jie; Zhao, Maoxiong; Liu, Liang; Xiang, Hong^*; Han, Dezhuan^*

来源：Journal of the Physical Society of Japan, 2017, 86(6): 064401.

DOI：10.7566/JPSJ.86.064401

• DESIGNER SURFACE-PLASMONS
• EXPERIMENTAL-VERIFICATION

Spoof-insulator-spoof (SIS) waveguides can support propagating modes of spoof surface plasmon polaritons (SPPs). Here, the symmetry properties and dependence of dimensionality of the spoof SPPs in SIS waveguides are studied both numerically and experimentally. The dispersions of spoof SPPs in two-dimensional (2D) waveguides are distinct from those in 3D waveguides. A cut-off frequency appears at k = 0 for the symmetric mode in the 2D structure. It is found that, from the 2D to 3D case, the dimensional dependence of the spoof SPPs in SIS waveguides is similar to the "real" SPPs in metal-insulator-metal (MIM) structures. However, their asymptotic behaviors for large k are quite different since the coupling in the direction of thickness are different for the spoof SPPs and "real" SPPs. Our results can be useful in both the physics and applications of the surface modes in the microwave regime.

• 出版日期2017-6-15
• 单位重庆大学