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从光波段圆孔形双鱼网结构的负折射材料模型出发,采用基于有限积分技术的CST软件系统研究了原胞结构的改变对负折射行为的影响.数值仿真结果表明,对原胞结构做微小调节也可获得负折射率频带的增大效应.将双鱼网结构改为阶梯形孔洞和半球形孔洞结构,可以在更多的频段里出现负折射率,并且谐振频率发生了一定的红移.半球形孔洞的双鱼网结构可以方便地用化学模板法制备,这为从实验上实现红外及可见光波段的多频负折射材料提供了一种简单可行的方法.
Based on the negative refraction material model of circular fish net structure in optical band, the effect of the change of the structure of the original cell on the negative refraction behavior was studied by CST software system based on the finite integral technique. The numerical simulation results show that the structure of the original cell is very small The negative refractive index band can also be obtained by adjusting.It is found that negative refractive index can occur in more frequency bands by changing the structure of the double-fish net to a stepped hole and a semi-spherical hole structure, and a certain red shift occurs in the resonance frequency. The pisces structure of hemispherical holes can be easily prepared by chemical template method, which provides a simple and feasible method for experimentally realizing multi-frequency negative refraction materials in the infrared and visible bands.