Photonic crystal nanocavity based on a topological corner state

By Y. Ota, Feng Liu, R. Katsumi, Katsuyuki Watanabe, K. Wakabayashi, Yasuhiko Arakawa, S. Iwamoto. Optica, 2018

234 citations recorded by the source corpus.

Topological phonics has emerged as a novel approach to engineer 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-degrees-angled rim of a two dimensional 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 observed 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.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1ec63b09df7e588ec5f4082f72bf8227df26e8a8

How researchers see this paper

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In Atomic and Molecular Physics, and Optics

1. A. Amo
2. T. Ozawa
3. M. Hafezi
4. Masaya Notomi
5. Michael J. Hartmann
6. Nathan Goldman

In Materials Chemistry

1. A. Amo
2. M. Hafezi
3. Masaya Notomi
4. T. Ozawa

Citations in the corpus

• Photonic quadrupole topological phases (2018, methodology): “Note: During the submission of this manuscript, we became aware of other related works [37, 38] which realize corner states of light using generalizations of the SSH model.”
• Active topological photonics (2019, background): “Nanocavities based on topological corner states were already demonstrated using 2D topological photonic crystals characterized with nontrivial 2D Zak phases [65].”