Guiding Electromagnetic Waves around Sharp Corners: Topologically Protected Photonic Transport in Metawaveguides
Guiding Electromagnetic Waves around Sharp Corners: Topologically Protected Photonic Transport in Metawaveguides
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DOI：
10.1103/physrevlett.114.127401
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发表时间：
2015-03-23
影响因子：
8.6
通讯作者：
Shvets, Gennady
中科院分区：
文献类型：
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作者：
Ma, Tzuhsuan;Khanikaev, Alexander B.;Shvets, Gennady
辐射的波动性质阻止了其在尖角周围的无反射传播。我们证明了一个简单的光子结构的基础上的周期性阵列的金属圆柱连接到两个限制金属板之一，可以模拟自旋轨道相互作用通过双各向异性。这样的元波导表现为具有完全拓扑带隙的光子拓扑绝缘体。具有相反符号的双各向异性的两个这样的结构之间的界面支持拓扑保护的表面波，其可以被引导而不会沿着界面的急剧弯曲沿着反射。
The wave nature of radiation prevents its reflections-free propagation around sharp corners. We demonstrate that a simple photonic structure based on a periodic array of metallic cylinders attached to one of the two confining metal plates can emulate spin-orbit interaction through bianisotropy. Such a metawaveguide behaves as a photonic topological insulator with complete topological band gap. An interface between two such structures with opposite signs of the bianisotropy supports topologically protected surface waves, which can be guided without reflections along sharp bends of the interface.