非对称结构平面电磁超材料的微波特性研究  

Microwave Response of Planar Metamaterial Structured by Asymmetrically Split Rings

作　　者：史金辉[1] 刘冉[1] 余胜武[1] 朱正 关春颖 王政平[1] 

机构地区：[1]哈尔滨工程大学理学院,哈尔滨150001

出　　处：《应用科学学报》2012年第4期369-373,共5页Journal of Applied Sciences

基　　金：国家自然科学基金(No.11104043);黑龙江省自然科学基金(No.LC201006);哈尔滨市青年科技创新人员专项基金(No.2012RFLXG030);中央高校基本科研业务费专项资金资助

摘　　要：利用有限元法研究了非对称平面电磁超材料的Fano谐振.给出了谐振频率处的表面激发电流分布,利用Fano公式对非对称电磁超材料的透射谱进行拟合.逐一分析单一金属环的电磁响应,发现非对称金属弧之间的耦合作用导致了Fano谐振.分析了结构参量对Fano谐振性能的影响,并研究了入射电磁波偏振旋转角对Fano谐振的影响.结果表明,旋转偏振角是实现metamaterial性能调谐的方式之一.In the paper, Fano resonances in a planar metamaterial with asymmetrically split rings are investigated using the finite element method. Excited surface current distributions are presented. The transmission spectrum of the metamaterial is also fitted based on the Fano formula. The electromagnetic response of each metallic ring is studied individually. It is found that the Fano resonances are due to the coupling between two asymmetric metallic resonators. Further, effects of the structural parameters on the Fano resonance are analyzed. Finally, dependence of Fano resonance on polarization rotation angles of the incident electromagnetic waves is studied. Simulation results reveal that polarization rotation angles of incident electromagnetic waves provides an easy approach of tuning the performance of metamaterials.

关 键 词：电磁超材料 开口谐振环 Fano谐振 表面电流 透射 

分 类 号：O444[理学—电磁学]