Robust and Broadband Optical Coupling by Topological Waveguide Arrays,Laser & Photonics Reviews

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Robust and Broadband Optical Coupling by Topological Waveguide Arrays
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-01-13 , DOI: 10.1002/lpor.201900193
Wange Song _{1,

2} , Wenzhao Sun ₃ , Chen Chen _{1,

2} , Qinghai Song ₃ , Shumin Xiao ₃ , Shining Zhu _{1,

2} , Tao Li _{1,

2}

Affiliation

Photonic topological states have been exploited to give rise to robust optical behaviors that are quite insensitive to local defects or perturbations, which provide a promising solution for robust photonic integrations. Specifically, for example, optical coupling between waveguides is a universal function in integrated photonics. However, the coupling performance usually suffers from high structure‐sensitivity and challenges current manufacturing for massive production. Here, the topological edge state in a finite Su–Schriffer–Heeger modeled optical waveguide array is explored and robust optical coupling (e.g., directional coupling and beam splitting) is demonstrated, which is quite insensitive to structural variations. It is experimentally proved that even a large discrepancy (21–26% structural deviation) in silicon waveguides gaps has little influence on optical coupling (>90% performance), while conventional counterparts totally break down. Moreover, thanks to such a topological design, the devices show much broader working bandwidth (≈10 times performance improvement) than the conventional ones, greatly favoring the photonic integrations. This work would inspire new families of optical devices with robust and broadband properties that can excite more interesting and useful exploration in both fields, and possibly open a new avenue toward topological devices with unique properties and functionalities.

中文翻译：

拓扑波导阵列实现的健壮和宽带光耦合

已经开发出光子拓扑状态以产生对局部缺陷或扰动非常不敏感的鲁棒的光学行为，这为鲁棒的光子集成提供了有希望的解决方案。具体而言，例如，波导之间的光耦合是集成光子学中的通用功能。但是，耦合性能通常受到结构敏感性高的困扰，并且对当前的大规模生产制造提出了挑战。在此，探索了在有限的Su–Schriffer–Heeger模型光波导阵列中的拓扑边缘状态，并演示了鲁棒的光耦合（例如，定向耦合和分束），这对结构变化非常不敏感。实验证明，即使在硅波导间隙中存在较大差异（21-26％的结构偏差），对光耦合的影响也很小（> 90％的性能），而常规的对应器件会完全损坏。而且，由于采用了这种拓扑设计，该器件的工作带宽比传统器件宽得多（性能提高了约10倍），极大地有利于光子集成。这项工作将激发具有健壮和宽带特性的新光学设备系列，这将激发这两个领域的更多有趣和有用的探索，并可能为具有独特特性和功能的拓扑设备开辟一条新途径。与传统器件相比，该器件的工作带宽要宽得多（性能提高约10倍），极大地有利于光子集成。这项工作将激发具有健壮和宽带特性的新光学设备系列，这将激发这两个领域的更多有趣和有用的探索，并可能为具有独特特性和功能的拓扑设备开辟一条新途径。与传统器件相比，该器件的工作带宽要宽得多（性能提高约10倍），极大地有利于光子集成。这项工作将激发具有健壮和宽带特性的新光学设备系列，这将激发这两个领域的更多有趣和有用的探索，并可能为具有独特特性和功能的拓扑设备开辟一条新途径。

更新日期：2020-01-13

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