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arXiv 2303.00809physics.optics
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铌酸锂纳米波导等间距阵列中的拓扑边缘态

Topological edge states in equidistant arrays of Lithium Niobate nano-waveguides

Andrey V. Gorbach, Jesper Beer, Anton Souslov

AI总结:

本研究发现薄膜铌酸锂纳米波导一维等间距阵列普遍支持拓扑边缘态,其拓扑特性由两类不同宇称导模的模内、模间耦合共同决定,利用同波导双模式设计拓扑不变量可减半系统尺寸、简化结构,并验证了两类结构中不同模式的拓扑边缘态可在宽参数范围观测。

摘要:

我们报道了薄膜铌酸锂纳米波导构成的一维等间距阵列普遍支持拓扑边缘态。与传统的耦合波导拓扑系统不同,这类阵列的拓扑特性由两类具有不同宇称的导模族的模内与模间耦合的相互作用决定。利用同一波导内的两种模式设计拓扑不变量,可使系统尺寸缩小为原来的二分之一,并大幅简化结构。我们给出了两种示例几何结构,其中不同类型(基于准TE模或准TM模)的拓扑边缘态可在宽波长范围和阵列间距范围内被观测到。

英文摘要:

We report that equidistant 1D arrays of thin-film Lithium Niobate nano-waveguides generically support topological edge states. Unlike conventional coupled-waveguide topological systems, the topological properties of these arrays are dictated by the interplay between intra- and inter-modal couplings of two families of guided modes with different parities. Exploiting two modes within the same waveguide to design a topological invariant allows us to decrease the system size by a factor of two and substantially simplify the structure. We present two example geometries where topological edge states of different types (based on either quasi-TE or quasi-TM modes) can be observed within a wide range of wavelengths and array spacings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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