工型超材料共振研究  

Resonance of I-Shaped Metamaterials

作　　者：刘瑶 陈跃刚 Liu Yao, Chen Yuegang(School of Physics, Guizhou University, Guiyang, Guizhou 550025, Chin)

机构地区：[1]贵州大学物理学院,贵州贵阳550025

出　　处：《光学学报》2018年第3期402-407,共6页Acta Optica Sinica

基　　金：贵州省科技合作计划(黔科合LH字[2015]7642);国家自然科学基金(11764006;61650403)

摘　　要：工型金属结构单元构成的超材料具有异常的电磁性质。利用时域有限差分法对工型结构超材料进行模拟研究后发现:当结构对称时,出现了3个模;当结构的对称性破缺和尺寸增加时,分别出现了1个新模,结构中存在5个特殊的反射模。建立理论模型,结合近场分布分析了这5个反射模形成的物理原因,认为:表面等离子体在工型结构单元内不同位置的共振耦合导致了这5个特殊的反射模;当结构的对称性破缺时,出现新的共振模;当结构尺度增加时,出现了高阶共振模。Metamaterials with I-shaped metal structure units have abnormal electromagnetic properties. The finite difference time domain （FDTD） method is used to simulate the I-shaped metamaterials. It is found that there are three special reflected modes in symmetric I-shaped structure. When the symmetry of the structure is broken and the slit length increases, a new mode appears, respectively, and five specific reflection modes are in the structure. Theoretical model is developed and physical causes of formation of the five reflection modes are analyzed combing near field distribution. It is believed that different position resonance couplings of surface ptasmons in the I-shaped metal structure units lead to the five specific reflection modes. When the symmetry of the structure is broken, new resonant mode appears. When the slit length increases, high order resonance mode appears.

关 键 词：表面光学 表面等离子体 电磁诱导反射 共振模耦合 超材料 

分 类 号：O436[机械工程—光学工程]