Photonic crystal nanocavity based on a topological corner state

Yasutomo Ota, Feng Liu, Ryota Katsumi, Katsuyuki Watanabe, Katsunori Wakabayashi, Yasuhiko Arakawa, Satoshi Iwamoto

研究成果: Article査読

184 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)786-789
ページ数4
ジャーナルOptica
6
6
DOI
出版ステータスPublished - 2019 6月 20
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学

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