Quasi-Line Waves in Self-Inductive Impedance Surfaces

Line waves are modes that propagate along a line connecting two-dimensional impedance surfaces with dual electromagnetic responses. In general, line waves can be implemented using complementary impedances or impedances with a gain-loss effect. On the other hand, if the two impedance surfaces are non-complementary, they can support a different type of mode called a "quasi-line wave". We propose a different configuration to implement quasi-line waves. Indeed, non-dual structures with purely inductive impedances are used in order to drive the mode. We investigate the implementation of quasi-line modes using multilayer graphenes. This mode has a wide bandwidth in the terahertz range and a significant propagation length. The proposed structure guides one-way modes in which the fields are highly concentrated around the edges of two inductive impedance structures. Furthermore, incorporating graphene into the proposed waveguide allows for control of bandwidth and transmission characteristic of the waveguide.