Abstract
The valley topological edge states (VTESs) have become a new research hotspot in topological photonics because of its flexibility and diversity. The major challenge for them comes from the limit bandwidth, the weak energy of localized field and the weak ability of direction-locked. In this paper, through the design of a triangular lattice with a compound unit cell, it is demonstrated that with the coupling of the VTESs and the defect states, some new hybrid VTESs called valley topological defect-edge states (VTDESs) occur and their performance can be greatly enhanced. Through enlarging the interval between the two lattices with opposite valley topological phases, the VTDESs absorb both the topological properties of the pure VTESs, and the properties of intense field and wide bandwidth of the defect states. The VTDESs have larger bandwidth, more intense transmission energy and the ideal ability of direction-locked. The robust transmission property against the structure obstacle has been demonstrated for the VTDESs.
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