Valley Kink States and Topological Channel Intersections in Substrate‐Integrated Photonic Circuitry,Laser & Photonics Reviews

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Valley Kink States and Topological Channel Intersections in Substrate‐Integrated Photonic Circuitry
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2019-10-07 , DOI: 10.1002/lpor.201900159
Li Zhang _{1,

2} , Yihao Yang _{1,

2,

3,

4} , Mengjia He _{1,

2} , Hai‐Xiao Wang ₅ , Zhaoju Yang ₃ , Erping Li ₁ , Fei Gao _{1,

2} , Baile Zhang _{3,

4} , Ranjan Singh _{3,

4} , Jian‐Hua Jiang ₅ , Hongsheng Chen _{1,

2}

Affiliation

Valley degrees of freedom, providing a novel way to increase capacity and efficiency of information processing, have become an important instrument for photonics. Experimental studies on photonic topological valley kink states at interfaces between regions with opposite valley‐Chern numbers have attracted much attention; however, they are restricted to zigzag‐type interfaces, largely limiting their applications such as geometry‐dependent topological channel intersections. Here, valley kink states at generic interfaces in subwavelength substrate‐integrated photonic circuitry are experimentally demonstrated and manipulated. The robustness of the kink states is verified by measuring transmissions of the kink states through twisted interfaces and interfaces with disorders. Based on the valley kink states at generic interfaces, several topological channel intersections where photonic transport paths are related to geometries of the intersections are realized. In comparison to those in previous work, these valley photonic crystals have subwavelength thicknesses and excellent self‐consistent electrical shielding, which are perfectly compatible with conventional substrate‐integrated photonic circuitry. This work opens a door to manipulate photonic valley pseudo‐spins in lightweight substrate‐integrated circuitry with robustness and easy access.

中文翻译：

基板集成光子电路中的山谷扭结状态和拓扑通道相交

谷自由度提供了一种提高信息处理能力和效率的新颖方法，已经成为光子学的重要工具。在具有相反谷-Chern数的区域之间的界面上进行光子拓扑谷扭结状态的实验研究引起了广泛的关注。但是，它们仅限于之字形接口，极大地限制了它们的应用，例如与几何相关的拓扑通道交叉点。在这里，通过实验演示和操纵了亚波长基片集成光子电路中通用界面处的谷扭结状态。扭结状态的鲁棒性是通过测量扭结状态通过扭曲界面和有紊乱的界面的传输来验证的。根据通用接口处的山谷扭结状态，实现了几个拓扑通道交叉口，其中光子传输路径与交叉口的几何形状有关。与以前的工作相比，这些谷型光子晶体具有亚波长的厚度和出色的自洽电屏蔽性能，与传统的集成有衬底的光子电路完美兼容。这项工作为轻巧的基板集成电路中的鲁棒性和易于操作性开辟了操纵光子谷伪自旋的门。与传统的基片集成光子电路完全兼容。这项工作为轻巧的基板集成电路中的鲁棒性和易于操作性开辟了操纵光子谷伪自旋的门。与传统的基片集成光子电路完全兼容。这项工作为轻巧的基板集成电路中的鲁棒性和易于操作性开辟了操纵光子谷伪自旋的门。

更新日期：2019-10-07

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