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arXiv 2102.09252physics.opticscond-mat.mes-hallphysics.app-ph
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谷型光子晶体拓扑慢光波导的实验演示

Experimental demonstration of topological slow light waveguides in valley photonic crystals

Hironobu Yoshimi, Takuto Yamaguchi, Ryota Katsumi, Yasutomo Ota, Yasuhiko Arakawa, Satoshi Iwamoto

摘要:

实验研究了谷型光子晶体中的拓扑慢光波导。我们采用了两个拓扑结构不同的VPhCs图案化的空气桥接的硅板之间形成的胡须接口。该接口支持灯光线下的拓扑和非拓扑慢光模式。利用光学显微镜观察了慢光区的拓扑模光传输,群指数为$n_{\rm g}$/$30$。此外,我们证实了即使在尖锐的波导弯曲的存在下,通过慢光模式的光传输。在拓扑和非拓扑模式之间的比较,我们发现,拓扑模式表现出更有效的波导比平凡的,阐明在慢光制度的拓扑保护。这项工作为探索与现有光子学技术兼容的拓扑慢光器件铺平了道路。

英文摘要:

We experimentally demonstrate topological slow light waveguides in valley photonic crystals (VPhCs). We employed a bearded interface formed between two topologically-distinct VPhCs patterned in an air-bridged silicon slab. The interface supports both topological and non-topological slow light modes below the light line. By means of optical microscopy, we observed light propagation in the topological mode in the slow light regime with a group index $n_{\rm g}$ over $30$. Furthermore, we confirmed light transmission via the slow light mode even under the presence of sharp waveguide bends. In comparison between the topological and non-topological modes, we found that the topological mode exhibits much more efficient waveguiding than the trivial one, elucidating topological protection in the slow light regime. This work paves the way for exploring topological slow-light devices compatible with existing photonics technologies.

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