Yafeng Chen, Zhihao Lan, Hai-Xiao Wang, Liang An, Zhongqing Su
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引用次数: 0
摘要
具有螺旋边缘态的光子拓扑晶体绝缘体(PTCIs)为实现稳健的电磁波传输和处理提供了另一种途径。然而,现有的大多数 PTCIs 只涉及一个拓扑带隙,而且一般只支持一对间隙螺旋边缘态,这限制了其在多波段波导、滤波器和通信系统等各个领域的应用范围。在这里,我们通过将拓扑优化方法引入具有滑行对称性的光子晶体,设计出了双波段 PTCI,在两个不同的体隙内出现多个螺旋边缘模式,分别用于横向电(TE)和横向磁(TM)模式。对于具有 TE 模式的 PTCIs,两个正交边界所承载的边缘模式的不匹配频率范围为实现光子解复用器提供了机会。对于具有 TM 模式的 PTCI,我们通过将第一带隙和第二带隙内边缘模式的频率范围分别与基波和 SH 波相匹配,展示了通过多频带边缘模式的耦合增强二次谐波(SH)的产生。这项工作为设计具有螺旋边缘态的多频带 PTCIs 提供了一种新方法,在开发线性和非线性应用的多频带拓扑光子器件方面具有广阔的前景。
Topology-optimized photonic topological crystalline insulators with multiband helical edge states
Photonic topological crystalline insulators (PTCIs) with helical edge states provide an alternative way to achieve robust electromagnetic wave transport and processing. However, most existing PTCIs only involve a single topological bandgap, and generally support a pair of gapped helical edge states, restricting the scope of applications in various fields such as multiband waveguides, filters, and communication systems. Here, we design dual-band PTCIs, in which multiple helical edge modes appear within two distinct bulk gaps, for transverse electric (TE) and transverse magnetic (TM) modes, respectively, by introducing the topology optimization method into the photonic crystals with glide symmetry. For PTCIs with TE modes, the mismatched frequency ranges of edge modes hosted by two orthometric boundaries offer an opportunity to realize a photonic demultiplexer. For PTCIs with TM modes, we show the enhanced second harmonic (SH) generation through the coupling of multiband edge modes by matching the frequency ranges of edge modes within the first and second bandgaps to fundamental and SH waves, respectively. This work provides a new way for designing multiband PTCIs with helical edge states, having promising potentials in developing multiband topological photonic devices for both linear and nonlinear applications.
期刊介绍:
New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.