Zhang Hongxiang, Xie Rensheng, Tao Xiaofeng, Gao Jianjun
Key Laboratory of Polar Materials and Devices, Department of Electronic Sciences, School of Physics and Electronic Sciences, East China Normal University, Shanghai 200241, China.
Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences & The Photonics Institute, Nanyang Technological University, Singapore 639798, Singapore.
Nanophotonics. 2024 Jun 19;13(19):3727-3736. doi: 10.1515/nanoph-2024-0192. eCollection 2024 Aug.
Heterostructures play a pivotal role in the design of valley-locked waveguides, facilitating the manipulation of width as an additional degree of freedom. Through this design, we demonstrate the extension of the topological guided modes from the domain wall of topologically nontrivial valley photonic crystals (VPCs) into the trivial VPCs. We propose a C impurity to control the states of the light wave transmission in topological valley-locked waveguides through the intervalley scattering of defects in Quantum Valley Spin Hall topological insulators. By rotating the C structure, the ON/OFF (0°/45°) state of the valley-locked waveguides can be controlled, effectively serving as a switch component. Furthermore, many unique applications could be devised based on the introduced impurity. Examples include the development of coding channels with arbitrary output ports and energy concentrators with enhanced secondary concentration. The proposed topological valley-locked waveguides with C impurity will be beneficial for on-chip integrated photonic networks.
异质结构在谷锁定波导的设计中起着关键作用，有助于将宽度作为额外的自由度进行操控。通过这种设计，我们展示了拓扑引导模式从拓扑非平凡谷光子晶体（VPC）的畴壁扩展到平凡VPC中。我们提出一种C杂质，通过量子谷自旋霍尔拓扑绝缘体中缺陷的谷间散射来控制拓扑谷锁定波导中光波传输的状态。通过旋转C结构，可以控制谷锁定波导的开/关（0°/45°）状态，有效地用作开关组件。此外，基于引入的杂质可以设计出许多独特的应用。示例包括具有任意输出端口的编码通道和具有增强二次集中的能量集中器的开发。所提出的带有C杂质的拓扑谷锁定波导将有利于片上集成光子网络。
