arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.10426physics.optics
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光子谷霍尔绝缘体中拓扑保护的Fano共振

Topologically protected Fano resonance in photonic valley Hall insulators

Chang-Yin Ji, Yongyou Zhang, Bingsuo Zou, Yugui Yao

摘要:

光子学的迅速发展带来了许多有趣的共振光学现象,其中Fano共振(FR)因其在光开关和光传感中的应用而一直备受研究者的关注。然而,它对环境条件的敏感依赖性使得它很难在实验中实现。我们在这项工作中提出了一个拓扑保护FR的基础上的光子谷霍尔绝缘体,免疫系统杂质。拓扑保护的FR是通过耦合谷依赖的拓扑边缘态(TES)与一个双简并腔实现的。我们建立的$δ$型光子输运理论揭示了这种拓扑FR源于奇偶奇腔模和奇偶偶腔模两种传输的干涉。我们证实,诱导的Fano线形状的透射光谱是强大的弯曲畴壁和障碍。我们的工作可能会引发令人兴奋的前沿操纵谷运输和铺平了道路的拓扑保护的光子器件,如光开关,低阈值激光器和超灵敏传感器。

英文摘要:

Rapidly developing photonics brings many interesting resonant optical phenomena, in which the Fano resonance (FR) always intrigues researchers because of its applications in optical switching and sensing. However, its sensitive dependence on environmental conditions makes it hard to implement in experiments. We in this work suggest a topologically-protected FR based on the photonic valley Hall insulators, immune to the system impurities. The topologically-protected FR is achieved by coupling the valley-dependent topological edge states (TESs) with one double-degenerate cavity. The $δ$-type photonic transport theory we build reveals that this topological FR dates from the interference of the two transmissions that are attributed to the parity-odd cavity mode and the parity-even one. We confirm that the induced Fano line shape of the transmission spectra is robust against the bending domain walls and disorders. Our work may provoke exciting frontiers for manipulating the valley transport and pave a way for the topologically protected photonic devices such as optical switches, low-threshold lasers, and ultra-sensitive sensors.

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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