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Description:

We successfully materialized a complete common band gap of a 6.0% width relative to the mid-gap frequency for transverse-electric-like eigenmodes, which was shared by topologically trivial and non-trivial photonic crystals (PhCs) fabricated in the top Si layer of silicon-on-insulator wafers. We verified the presence of the complete common band gap, which is a prerequisite for the topologically protected edge mode, by angle-resolved reflection spectroscopy in the mid-infrared range. By applying polarization selection rules expected from the spatial symmetry of the electromagnetic eigenmodes, we confirmed the band inversion at the center of the first Brillouin zone (Gamma point) in a purely experimental manner. We further detected the edge modes localized on the boundary between the trivial and non-trivial PhCs, which were linearly polarized in the vicinity of the Gamma point due to the mixture of upper and lower branches with circular polarizations, and obtained their dispersion relation.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: topological edge mode, photonic crystal, topological band gap, mid-infrared, angle-resolved spectroscopy, silicon on insulator

Date published: 2023-11-15

Publisher: Physical Society of Japan

Journal:

• JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN (ISSN: 00319015) vol. 92 p. 11402-11402

Funding:

• ATLA, Japan Innovative Science and Technology Initiative for Security, Grant Number JPJ004596

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.7566/JPSJ.92.114402

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Updated at: 2024-03-19 16:57:25 +0900

Published on MDR: 2024-03-19 16:57:25 +0900