An ultra-compact one-dimensional topological photonic crystal (1D-TPC) is designed in a single mode silicon bus-waveguide to generate the Fano resonance lineshape. The Fano resonance comes from the interference between the discrete topological boundary state of the 1D-TPC and the continuum high-order leaky mode of the bus-waveguide. Standalone asymmetric Fano resonance lineshapes are obtained experimentally in the waveguide transmission spectrum with a maximum extinction ratio of 33 dB and a slope ratio of 10 dB/nm over a broadband flat background.

中文翻译：

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来自一维拓扑光子晶体的法诺共振

超紧凑的一维拓扑光子晶体 (1D-TPC) 设计在单模硅总线波导中，以产生 Fano 共振线形。Fano 共振来自 1D-TPC 的离散拓扑边界状态与总线波导的连续高阶泄漏模式之间的干扰。在波导传输光谱中通过实验获得了独立的非对称 Fano 共振线形，在宽带平坦背景上，最大消光比为 33 dB，斜率为 10 dB/nm。