2019年6月20日
Photonic crystal nanocavity based on a topological corner state
Optica
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- 巻
- 6
- 号
- 6
- 開始ページ
- 786
- 終了ページ
- 789
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1364/OPTICA.6.000786
© 2019 Optical Society of America. Topological photonics has emerged as a novel approach to engineering the flow of light and provides unprecedented means for developing diverse photonic elements, including robust optical waveguides immune to structural imperfections. However, the development of nanoscale standing-wave cavities in topological photonics is rather slow, despite its importance when building densely integrated photonic integrated circuits. In this Letter, we report a photonic crystal nanocavity based on a topological corner state, supported at a 90-deg-angled rim of a twodimensional photonic crystal. A combination of the bulk-edge and edge-corner correspondences guarantees the presence of the higher-order topological state in a hierarchical manner. We experimentally observe a corner mode that is tightly localized in space while supporting a high Q factor over 2,000, verifying its promise as a nanocavity. These results cast new light on the way to introduce nanocavities in topological photonics platforms.
- リンク情報
- ID情報
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- DOI : 10.1364/OPTICA.6.000786
- ISSN : 2334-2536
- SCOPUS ID : 85068264877