Surface waves with negative phase velocity supported by temperature-dependent hyperbolic materials
Surface waves with negative phase velocity supported by temperature-dependent hyperbolic materials
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DOI：
10.1088/2040-8986/ab2a5f
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发表时间：
2019-08-01
影响因子：
2.1
通讯作者：
Lakhtakia, Akhlesh
中科院分区：
文献类型：
--
作者：
Mackay, Tom G.;Lakhtakia, Akhlesh
用数值方法研究了两种温敏材料的平面界面导引的电磁表面波的传播。一种配对材料被选为各向同性，另一种被选为各向异性。这两种配对材料都是基于温度敏感半导体InSb的工程复合材料。在低温下，各向异性配对材料为非双曲型单轴材料；随着温度的升高，该材料变为双曲型单轴材料。在低温下，孤立的Dyakonov波在平行于平面界面的一系列方向上沿任意特定方向传播。在高温下，多达三种不同的表面波可以在平行于平面界面的特定方向上传播；其中一种表面波以负相速度(NPV)传播。在一定温度下，随着各向同性配对材料中InSb体积分数的减少，NPV传播的方向范围均匀减小。当InSb在各向同性配对材料中的体积分数固定时，NPV传播的角度范围随着温度的变化而变化。
A numerical investigation was undertaken to elucidate the propagation of electromagnetic surface waves guided by the planar interface of two temperature-sensitive materials. One partnering material was chosen to be isotropic and the other to be anisotropic. Both partnering materials were engineered composite materials, based on the temperature-sensitive semiconductor InSb. At low temperatures the anisotropic partnering material is a non-hyperbolic uniaxial material; as the temperature is raised this material becomes a hyperbolic uniaxial material. At low temperatures, a solitary Dyakonov wave propagates along any specific direction in a range of directions parallel to the planar interface. At high temperatures, up to three different surface waves can propagate in certain directions parallel to the planar interface; one of these surface waves propagates with negative phase velocity (NPV). At a fixed temperature, the range of directions for NPV propagation decreases uniformly in extent as the volume fraction of InSb in the isotropic partnering material decreases. At a fixed volume fraction of InSb in the isotropic partnering material, the angular range for NPV propagation varies substantially as the temperature varies.