论文标题
时空超材料的均质理论
Homogenisation Theory of Space-Time Metamaterials
论文作者
论文摘要
我们为时空超材料的同质化理论提供了一个一般框架。通过映射与时空调制的框架，我们为低频限制以有效的材料参数得出了分析公式：电动介电常数，磁渗透性和磁电耦合。值得注意的是，我们表明，在没有背面反射的情况下，该理论在所有频率上都是精确的，并且在这种情况放松时，该理论是在低频时精确的。这使我们能够通过通过电磁介质的旅行波调制的光传播的光线来得出精确的公式。
We present a general framework for the homogenisation theory of space-time metamaterials. By mapping to a frame co-moving with the space-time modulation, we derive analytical formulae for the effective material parameters for travelling wave modulations in the low frequency limit: electric permittivity, magnetic permeability and magnetoelectric coupling. Remarkably, we show that the theory is exact at all frequencies in the absence of back-reflections, and exact at low frequencies when that condition is relaxed. This allows us to derive exact formulae for the Fresnel drag experienced by light travelling through travelling-wave modulations of electromagnetic media.
