Topological Edge States and Solitons on a Dynamically Tunable Domain Wall of Two Opposing Helical Waveguide Arrays

• DOI: 10.1021/acsphotonics.0c01771
• Publication Date: 2021-03-17T11:38:55Z
• Authors: Zhiwei Shi; Maowu Zuo; Huagang Li; Daryl Preece; Yiqi Zhang; Zhigang Chen
• Keywords: Helicity; Helix (gastropod); Lattice (music); Waveguide

We study linear and nonlinear topological edge states on the domain wall (DW) of two helical waveguide arrays with opposite helicities. This composite structure is constructed by using multibeam interference (MBI) method, in which helix pitch helicity readily modulated varying charge an interfering vortex beam. The are characterized gap Chern number, their propagation dynamics controlled tunable lattice DW structure. In region, we find exist only within a threshold value radius for certain disorder pitch. surprisingly, that it possible to form quasi-solitons along DW, including multipole-like solitons whose different poles either side exhibit long-distance such numerically studied from evolution intensity patterns "center mass".