异向介质谐振响应的Floquet模分析

Floquet mode analysis on the resonance behavior of metamaterials

将开口谐振环单元的场分布利用Floquet模展开,从电磁波传播角度揭示了凋落模引起异向介质谐振响应的事实.数值计算了任意平面电磁波照射下异向介质的传输特性.研究表明,对于来自主平面上的垂直或平行极化的入射波,具有相同极化方式的Floquet透射模将发生谐振,并且磁谐振和电谐振将随着入射角的不同而改变.而对于来自其他入射平面的电磁波,两种极化的Floquet透射模将共同发生谐振.

The field distribution over a split ring resonator is expanded into Floquet modes,revealing the fact that the evanescent floquet modes actually lead to the metamaterial resonance behavior. Transmission through metamaterials is examined for arbitrary incident wave. It is shown that the resonance happens in the transmitted modes with the same polarization as that of the wave incident in the main plane. The electric and the magnetic resonances vary with the incidence angle. For the wave from other incident planes,the TE-and TM-Floquet modes will share the resonance.