Design and Observation of Topological Band Gaps and Edge Modes of SOI Photonic Crystal Slabs in the Mid-Infrared Range

Afshan Begum; Yuanzhao Yao; Takashi Kuroda; Yoshihiko Takeda; Naoki Ikeda; Yoshimasa Sugimoto; Takaaki Mano; Kazuaki Sakoda

doi:10.7566/JPSJ.92.114402

論文 Design and Observation of Topological Band Gaps and Edge Modes of SOI Photonic Crystal Slabs in the Mid-Infrared Range

Afshan Begum ; Yuanzhao Yao ; Takashi Kuroda (National Institute for Materials Science) ; Yoshihiko Takeda ; Naoki Ikeda ; Yoshimasa Sugimoto ; Takaaki Mano ; Kazuaki Sakoda

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Afshan Begum, Yuanzhao Yao, Takashi Kuroda, Yoshihiko Takeda, Naoki Ikeda, Yoshimasa Sugimoto, Takaaki Mano, Kazuaki Sakoda. Design and Observation of Topological Band Gaps and Edge Modes of SOI Photonic Crystal Slabs in the Mid-Infrared Range. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN. 2023, 92 (), 11402-11402. https://doi.org/10.7566/JPSJ.92.114402

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(abstract)

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.

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