基于谷霍尔超晶体的多通道频率路由器
Multi-channel frequency router based on valley-Hall metacrystals
AI总结：
本文提出利用ABA三明治结构中扶手椅形界面的谷霍尔超晶体，通过调节单个几何参数在定制频带内产生界面态，实现了低串扰的多通道光子频率路由器，并实验验证了其鲁棒传输性能。
摘要：
拓扑光子学通过利用最初在凝聚态物质中提出的各种拓扑相，彻底改变了电磁波的操控方式，实现了鲁棒且抗误差的信号处理。尽管已有大量努力，但在宽带频率范围内设计具有有限串扰的频率路由器仍然是一个关键挑战。以往的设计通常依赖于参数的精细调节，难以高效且紧凑地集成。针对片上光子学中对频率选择性应用的需求，本文探索了一种通过谷霍尔超晶体实现光子频率路由器的拓扑方法。与大多数聚焦于锯齿形界面的研究不同，本文将注意力转向ABA三明治结构中的扶手椅形界面，其中单列B型超晶体作为背景A型超晶体中的微扰。本质上，通过调节B型超晶体的单个几何参数，该构型在定制频率带内产生界面态，从而以有限的串扰实现信号路由，满足特定需求。此外，这一概念通过一个具有三个不同通道的光子频率路由器得到了实际演示，实验展示了鲁棒的波传输，与设计高度吻合。本研究展示了扶手椅形界面在谷霍尔光子系统中可能的应用，并推动了既紧凑又高效的光子器件的发展。值得注意的是，该方法天然兼容片上光子学与集成，有望惠及电信和光学计算应用。
英文摘要：
Topological photonics has revolutionized manipulations of electromagnetic waves by leveraging various topological phases proposed originally in condensed matters, leading to robust and error-immune signal processing. Despite considerable efforts, a critical challenge remains in devising frequency routers operating at a broadband frequency range with limited crosstalk. Previous designs usually relied on fine tuning of parameters and are difficult to be integrated efficiently and compactly. Here, targeting the demand for frequency-selective applications in on-chip photonics, we explore a topological approach to photonic frequency router via valley-Hall metacrystals. Diverging from the majority of studies which focuses on zigzag interfaces, our research shifts the attention to armchair interfaces within an ABA sandwich-like structure, where a single column of type-B metacrystal acts as a perturbation in the background type-A metacrystal. Essentially, through tuning a single geometric parameter of the type-B metacrystal, this configuration gives rise to interface states within a customized frequency band, enabling signal routing with limited crosstalk to meet specified demands. Moreover, this concept is practically demonstrated through a photonic frequency router with three distinct channels, experimentally exhibiting robust wave transmissions with excellent agreement with the design. This investigation manifests possible applications of the armchair interfaces in valley-Hall photonic systems and advances development of photonic devices that are both compact and efficient. Notably, the approach is naturally compatible with on-chip photonics and integration, which could benefit telecommunications and optical computing applications.
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