垂直入射条件下金属环的谐振特性

Resonant behavior of split ring resonator in perpendicular propagation

本文研究垂直入射条件下水平极化和垂直极化时金属开口谐振环(split ring resonator,SRR)的电磁响应行为.通过分析这两种情况下的透射系数、介电常数和磁导率,发现垂直极化时,SRR可以产生电谐振实现负介电常数,其频段远高于磁谐振频段;水平极化时,SRR只能产生磁谐振实现负磁导率,其频段与水平入射时的SRR的磁谐振频段相对应.通过仿真对此进行了证明,并对产生电谐振和磁谐振的原因进行了分析.

We systematically investigate the transmission characteristics of the split ring resonator（SRR） for propagation perpendicular to the plane of the ring resonator.Both the vertical polarization and the horizontal polarization are considered.A retrieval procedure is used to obtain permittivityεand permeabilityμ.It is found that in the normal incidence case the SRR also has strong electric and magnetic responses.The electric response occurs when electric field is parallel to the side of the SRR（vertical polarization） and the frequency band is often higher than that of magnetic resonance.The magnetic response needs a polarization rotation（horizontal polarization） and the magnetic resonant frequency is the same as that of parallel incidence.The conclusions are demonstrated and the reasons for the electric and magnetic resonances are also discussed theoretically.