Observation of Topological Transmission in Terahertz Domino Waveguide Array

In this article, we propose on-chip terahertz (THz) domino waveguide array structures that can enable the topological effect and enhance the robustness of THz transmission. THz topological effect (include topologically protected edge states and binding states) is excited by constructing kink and antikink structures in designed domino waveguide arrays. Furthermore, the robustness of topological waveguide arrays is successfully demonstrated. The topological transmission effects have been experimentally demonstrated using scanning near-field THz microscopy. Our study provides a new approach to study the topological photonic transport of waveguide arrays in the THz regime and has potential application in THz-integrated circuit.