https://scholars.lib.ntu.edu.tw/handle/123456789/573449
標題: | Photonic Chern insulators made of gyromagnetic hyperbolic metamaterials | 作者: | Shiu R.-C., Chan H.-C., Wang H.-X., Guo G.-Y. GUANG-YU GUO |
關鍵字: | Electromagnetic simulation; Energy gap; Interface states; Metal cladding; Nanocrystalline materials; Refraction; Surface waves; Topology; Waveguides; Applied magnetic fields; Chern numbers; Length scale; Negative refractions; Non-radiative; Strong contrast; Topological bands; Topological materials; Metamaterials | 公開日期: | 2020 | 卷: | 4 | 期: | 6 | 來源出版物: | Physical Review Materials | 摘要: | Controlling light propagation using artificial photonic crystals and electromagnetic metamaterials is an important topic in the vibrant field of photonics. Notably, chiral edge states on the surface or at the interface of photonic Chern insulators can be used to make reflection-free waveguides. Here, by both theoretical analysis and electromagnetic simulations, we demonstrate that gyromagnetic hyperbolic metamaterials (GHM) are photonic Chern insulators with superior properties. As a novel mechanism, the simultaneous occurrence of the hyperbolic and gyromagnetic effects in these metamaterials is shown to open the large topological band gaps with a gap Chern number of one. Importantly, the GHM Chern insulators possess nonradiative chiral edge modes on their surfaces, and thus allow us to fabricate unidirectional waveguides without cladding metals which generally incur considerable Ohmic loss. Furthermore, the photonic edge states in the proposed Chern insulators are robust against disorder on a wide range of length scales, in strong contrast to crystalline topological insulators, and the light flow direction on the surface of the Chern insulators can be easily flipped by switching the direction of an applied magnetic field. Fascinatingly, we find that negative refraction of the topological surface wave occurs at the boundary between the GHMs with the opposite signs of gyromagnetic parameters. Finally, we show that compared with other photonic topological materials such as chiral hyperbolic materials, the present GHM Chern insulators can be much easier to fabricate. ? 2020 American Physical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088259623&doi=10.1103%2fPhysRevMaterials.4.065202&partnerID=40&md5=120ff79f7a8d2f27a43e96cc6bc041eb https://scholars.lib.ntu.edu.tw/handle/123456789/573449 |
ISSN: | 24759953 | DOI: | 10.1103/PhysRevMaterials.4.065202 | SDG/關鍵字: | Electromagnetic simulation; Energy gap; Interface states; Metal cladding; Nanocrystalline materials; Refraction; Surface waves; Topology; Waveguides; Applied magnetic fields; Chern numbers; Length scale; Negative refractions; Non-radiative; Strong contrast; Topological bands; Topological materials; Metamaterials |
顯示於: | 物理學系 |
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