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利用二维拓扑自旋光子晶体中的螺旋边界态可以实现赝自旋锁定的光波的单向传输.尽管已有很多关于拓扑自旋光子晶体的研究，但对于其螺旋边界态的单向传输调控研究却很少.本文基于二维C6v对称的拓扑自旋光子晶体结构，通过调整原胞中介电圆柱直径D以及圆柱与原胞中心的距离R，详细研究了系统的几何参数对拓扑自旋光子晶体的带隙结构、拓扑性质及其螺旋边界态单向传输性质调控的影响.结果表明，参数R对拓扑自旋光子晶体的带隙结构和拓扑性质有显著影响，圆柱直径D的改变会影响自旋光子晶体的带隙位置.螺旋边界态的结构及其单向传输性质与边界两侧自旋光子晶体带隙的拓扑性质及频带结构密切相关.在拓扑性质不变的情况下，改变边界两侧的光子晶体结构，也会改变螺旋边界态的结构及其单向传输性质.调整拓扑自旋光子晶体结构的几何参数R和D，就可以实现对螺旋边界态的单向传输性质的调控.该研究为拓扑自旋光子晶体螺旋边界态的选择和应用提供了参考.The unidirectional propagation of the pseudospin-locked optical waves can be achieved by using the helical edge states in two-dimensional topological spin photonic crystals. Although there have been lots of researches on topological spin photonic crystal, the unidirectional propagation regulation of helical edge states is rarely studied up to now. Herein, by tuning the diameter D of the dielectric rod and the distance R between the center of the unit cell and the center of the rods in two-dimensional topological spin photonic crystal with C6v symmetry, the effects of geometric parameters on the bandgap structure, topological properties and unidirectional propagation of helical edge states in topological spin photonics crystals are studied in detail. The results show that the parameter R has significant effects on the bandgap structure and topological properties of topological spin photonic crystals, and the diameter D of rod only affect the bandgap positions. The structures of helical edge states and their unidirectional propagations are closely related to the topological properties of the bandgaps and the frequency structures of photonic crystals on both sides of boundary. Without changing of the topological properties of bandgaps, only altering the structure of the photonics crystal on either side of the boundary can also regulate the structures of the helical edge states and their unidirectional propagation. Thus, by adjusting the geometric parameters R and D of the topological spin photonic crystals, the helical edge states and their unidirectional propagations can be controlled. This study provides useful references for the selection and application of helical edge states in topological spin photonic crytals.
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Keywords:
- topological /
- spin /
- photonic crystal /
- edge state
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