Abstract

It is shown that direct electric current passing through a suspension of gyrotropic nanoparticles with residual magnetization (gyrotropic liquid metacrystal) forms a unidirectional waveguide for optical radiation so that trapped light can propagate only in the direction opposite to the direction of current. The localization of electromagnetic radiation is associated with the emergence of nonuniform gyrotropy of the medium as a result of reorientation of magnetic nanoparticles in the nonuniform magnetic field of the current. By way of examples, we consider the trapping of the radiation by a plane current sheet and by a cylindrical current-carrying filament. The dispersion equations of trapped modes are derived and analyzed. The analogy with topologically protected edge photon states is considered.

中文翻译：

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电流在回转型液态亚晶体中的光俘获

摘要

结果表明，直流电流通过具有残留磁化作用的回旋纳米颗粒悬浮液（回旋液态亚晶体）形成了用于光辐射的单向波导，因此捕获的光只能在与电流方向相反的方向上传播。由于电流的不均匀磁场中磁性纳米粒子的重新定向，电磁辐射的定位与介质不均匀的回旋的出现有关。通过示例的方式，我们考虑通过平面电流片和圆柱形载流灯丝捕获辐射。推导并分析了陷阱模的色散方程。考虑与具有拓扑保护的边缘光子状态的类比。