AI 中文总结
研究光子θ腔，利用干涉耦合克服近场耦合限制，通过镜对称交叉结建立器件物理，实现强腔限制和BICs。展示嵌套θ腔中多环谐振器的相位介导远程强耦合及能带结构杂交，提供可扩展、拓扑稳健的模式工程平台。
AI 中文摘要
θ腔是一种独特的拓扑谐振器架构，利用干涉耦合克服与近场倏逝耦合相关的基本设计限制，目前近场倏逝耦合主导着集成光子学的设计空间。其定义性的器件物理由镜对称交叉结建立，能在波导和环形谐振器之间保持高效功率传输，产生强相关相位关系。独特的模式选择物理允许干涉驱动抑制辐射路径，实现强腔限制和连续统束缚态（BICs）的出现。分析模型揭示了非厄米光学能带结构，显示出BIC和准BIC模式之间的非平凡拓扑转变，对克服基于硅的集成光子学的固有局限性至关重要。θ腔架构还规避了近场耦合波导中物理间隙的接近要求所带来的限制，为新器件提供了灵活的设计空间。在本研究中，我们展示了嵌套θ腔架构中多个环形谐振器的相位介导远程强耦合，展示了能带结构杂交，导致反交叉带隙、狄拉克交叉和法诺共振的形成。光子θ腔架构为跨多维参数空间的模式工程提供了一个可扩展、拓扑稳健的平台，对扰动和衰减具有高弹性，为集成腔器件的设计提供了一种新方法。
英文摘要
The Theta Cavity is a unique topological resonator architecture which utilizes interferometric coupling to overcome fundamental design limitations associated with near-field evanescent coupling which currently dominates the design space for integrated photonics. The defining device physics is established by the mirror symmetric cross junctions which preserves efficient power transfer between a waveguide and ring resonator creating a strongly correlated phase relationship between the multiple paths. The unique mode selection physics allows for interference driven suppression of radiative pathways enabling strong cavity confinement and the emergence of Bound States in the Continuum (BICs). Analytical models reveal non-Hermitian optical band structure displaying non-trivial topological transitions between BIC and quasi-BIC modes that are robust to attenuation, temperature variations, and typical fabrication non-idealities, which is critical for overcoming intrinsic limitations associated with silicon based integrated photonics. The Theta Cavity architecture also circumvents limitations that arise from proximity requirements of the physical gap used in near-field coupled waveguides which enables a flexible design space for new devices. In this study, we demonstrate phase mediated long-range strong coupling of multiple ring resonators in the Nested Theta Cavity architecture showcasing band structure hybridization resulting in the formation of anti-crossing bandgaps, Dirac crossings, and Fano resonances. The photonic Theta Cavity architecture provides a scalable, topologically robust platform for engineering modes across a multidimensional parameter space with high resilience to perturbation and attenuation, enabling a new approach for the designing of integrated cavity devices.
CommentsTo be published in ACS Photonics 2026, 42 pages, 22 figures. Keywords: Bound States in the Continuum, Integrated Photonics, Non-Hermitian Physics, Topological Robustness, Ring Resonators, Strong Coupling
DOI：10.1021/acsphotonics.6c00426
