Fig. 5From: Enhanced Confinement of Terahertz Surface Plasmon Polaritons in Bulk Dirac Semimetal-Insulator-Metal Waveguidesa Numerical transmission spectra for different cavity length L. b Resonant frequencies of modes 1 and 2 as functions of the cavity length L. Here, g = 1 μm, d = 5 μm, and EF = 70 meVBack to article page