异向介质平板对高斯波传播的影响

Impact of the metamaterial slab on the propagation of a Gaussian beam

为了研究异向介质的电磁特性,建立了高斯波束入射到异向介质平板模型.用数值模拟的方法给出了异向介质平板内外部电磁场的分布.异向介质采用周期排列的金属棒与开路环谐振器的阵列结构,工作在14.2GHz的频率上,对应的折射率为n=-0.71.模拟结果表明,异向介质平板对垂直入射的高斯波具有会聚的作用,对倾斜入射的高斯波在负方向上将产生比其他具有正折射率的平板更大的波束位移.

In order to study the electromagnetic properties of left-handed material, a Gaussian beam incident on a left-handed metamaterial slab was constructed. The numerical solutions to the electric and magnetic fields inside and outside the slab were presented. The metamaterial was realized with a periodic arrangement of rods and split-ring resonators, and the operating frequency was at 14.2 GHz, corresponding to a refraction index of -0.71. The results show that the metamaterial slab can focus the normal incident Gaussian beam; and that the displacement of an oblique incident beam provoked by such metamaterial slab is larger than that provoked by a slab with positive refraction index in the negative direction.