https://scholars.lib.ntu.edu.tw/handle/123456789/626667
標題: | Possible realization of optical Dirac points in woodpile photonic crystals | 作者: | Wang, Hai-Xiao Chen, Yige GUANG-YU GUO Kee, Hae-Young Jiang, Jian-Hua |
關鍵字: | WEYL POINTS; ACCIDENTAL DEGENERACY; SYMMETRY; Physics - Optics; Physics - Optics | 公開日期: | 9-五月-2022 | 出版社: | Optica Publishing Group | 卷: | 30 | 期: | 10 | 起(迄)頁: | 17204 | 來源出版物: | Optics express | 摘要: | The simulation of fermionic relativistic physics, e.g., Dirac and Weyl physics, has led to the discovery of many unprecedented phenomena in photonics, of which the optical-frequency realization is, however, still challenging. Here, surprisingly, we discover that the woodpile photonic crystals commonly used for optical frequency applications host exotic fermion-like relativistic degeneracies: a Dirac nodal line and a fourfold quadratic point, as protected by the nonsymmorphic crystalline symmetry. Deforming the woodpile photonic crystal leads to the emergence of type-II Dirac points from the fourfold quadratic point. Such type-II Dirac points can be detected by its anomalous refraction property which is manifested as a giant birefringence in a slab setup. Our findings provide a promising route towards 3D optical Dirac physics in all-dielectric photonic crystals. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626667 | ISSN: | 1094-4087 | DOI: | 10.1364/OE.456614 |
顯示於: | 物理學系 |
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