| Autor: |
Begum, Afshan, Yuanzhao Yao, Takashi Kuroda, Yoshihiko Takeda, Naoki Ikeda, Yoshimasa Sugimoto, Takaaki Mano, Kazuaki Sakoda |
| Zdroj: |
Journal of the Physical Society of Japan; 11/15/2023, Vol. 92 Issue 11, p114402-1-114402-8, 8p |
| Abstrakt: |
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 (#1043; 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 #1043; poin due to the mixture of upper and lower branches with circular polarizations, and obtained their dispersion relation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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