太赫兹波段谐振频率可调的开口谐振环结构

Tunable split ring resonators in terahertz band

开口谐振环(SRRs)结构可以激励磁谐振,实现负的磁导率.提出在SRRs两环间隙内引入相对交错的金属短线,并研究了金属短线对谐振频率的影响.结果表明:随着金属短线数目的增多,谐振频率显著降低,同时金属短线的结构参数如长度、宽度及间距也会对谐振频率产生影响.最后验证了金属短线的引入对减小器件尺寸有明显作用,且不因介质基底的存在而受到影响.新型磁谐振单元可为今后超材料的设计及实际应用提供新的参考.

Split ring resonators （SRRs） can be used as a negative permeability medium near its magnetic resonance frequency. In this paper, a new type of THz-band magnetic resonance structure is proposed by introducing metal wires into traditional SRRs, and the effect of metal wires on the transmission characteristics of SRRs is numerically investigated. The results show that the resonant frequency of SRRs significantly decreases with the number of metal wires increasing. The parameters of metal wires, such as length Lx, width Wx and distance Gx also have influence on the resonant frequency of SRRs. Meanwhile, the results verify that the introduction of metal wires play an important role in reducing the size of the device, and cannot be affected by the presence of dielectric substrate. The new magnetic resonance structure proposed in this paper provides a reference for the design and practical applications of metamaterials in the future.