On the refractive index for a nonmagnetic two-component medium: Resolution of a controversy

The refractive index of a dielectric medium comprising both passive and inverted components in its permittivity was determined using two methods: (i) in the time-domain, a finite-difference algorithm to compute the frequency-domain reflectance from reflection data for a pulsed plane wave that is normally incident on a dielectric half-space and (ii) in the frequency-domain, the deflection of an obliquely incident Gaussian beam on transmission through a dielectric slab. The dielectric medium was found to be an active medium with a negative real part for its refractive index. Thereby, a recent controversy in the scientific literature was resolved.

使用两种方法确定了介电常数中包含无源和反转成分的电介质的折射率：（i）在时域中，使用有限差分算法，根据垂直入射到电介质半空间的脉冲平面波的反射数据计算频域反射率；（ii）在频域中，通过电介质平板传输时倾斜入射高斯光束的偏转。发现该电介质是一种折射率实部为负的有源介质。从而解决了科学文献中最近的一个争议。