Observation of nonlinearity-controlled switching of topological edge states

Abstract

We report the experimental observation of the periodic switching of topological edge states between two dimerized fs-laser written waveguide arrays. Switching occurs due to the overlap of the modal fields of the edge states from topological forbidden gap, when they are simultaneously present in two arrays brought into close proximity. We found that the phenomenon occurs for both strongly and weakly localized edge states and that switching rate increases with decreasing spacing between the topological arrays. When topological arrays are brought in contact with nontopological ones, switching in topological gap does not occur, while one observes either the formation of nearly stationary topological interface mode or strongly asymmetric diffraction into the nontopological array depending on the position of the initial excitation. Switching between topological arrays can be controlled and even completely arrested by increasing the peak power of the input signal, as we observed with different array spacings.

arXiv comment8 pages, 6 figures

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• Nonlinear Non-Hermitian Skin Effect and Skin Solitons in Temporal Photonic Feedforward Lattices
• Optical control of topological end states via soliton formation in a 1D lattice
• Topological gap solitons in Rabi Su-Schrieffer-Heeger lattices
• Topological solitons in coupled Su-Schrieffer-Heeger waveguide arrays
• Macroscopic Zeno effect in Su-Schrieffer-Heeger photonic topological insulator
• Topological edge solitons in \{chi}(2) waveguide arrays
• Observation of nonlinear higher-order topological insulators with unconventional boundary truncations
• Rotating topological edge solitons