Dyakonov–Tamm waves guided by a phase–twist combination defect in a sculptured nematic thin film

The propagation of Dyakonov–Tamm waves guided by a phase–twist combination defect in a sculptured nematic thin film (SNTF) was studied theoretically by numerical solution of a dispersion equation. The phase defect was fixed at 180°, whereas the twist defect was kept variable as also the direction of propagation. Multiple Dyakonov–Tamm waves that differ in spatial profile, degree of localization, and phase speed were found to propagate guided by the combination defect, depending on the angle between the morphologically significant planes of the SNTF on either side of the defect as well as on the direction of propagation. The most strongly localized Dyakonov–Tamm waves turned out to be essentially confined within one structural period of the SNTF normal to the combination defect.

通过对一个色散方程进行数值求解，从理论上研究了在雕塑向列相薄膜（SNTF）中由相位扭转组合缺陷引导的狄亚科诺夫 - 塔姆波的传播。相位缺陷固定为180°，而扭转缺陷以及传播方向是可变的。发现多个在空间分布、局域程度和相速度上不同的狄亚科诺夫 - 塔姆波在组合缺陷的引导下传播，这取决于缺陷两侧SNTF的形态显著平面之间的角度以及传播方向。结果表明，局域性最强的狄亚科诺夫 - 塔姆波基本上被限制在垂直于组合缺陷的SNTF的一个结构周期内。