利用电介质柱共振器实现电磁响应模式可转变的电磁超介质  

Selectable electromagnetic response modes and negative refraction in rectangular dielectric metamaterials

作　　者：丁佩[1,2] 周强[1] 胡伟琴[1] 蔡根旺[1] 梁二军[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,郑州450052 [2]郑州航空工业管理学院数理系,郑州450015

出　　处：《物理学报》2011年第5期290-297,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10974183);航空科学基金(批准号:2008ZF55006)资助的课题~~

摘　　要：本文利用电磁场数值计算方法研究了横截面具有不同长宽比例的电介质柱的电磁共振模式,发现横截面长宽比例影响电介质柱共振模式的激发顺序.截面长宽比小于2.2时,首先激发磁共振模式;而长宽比大于2.2时,磁共振模式在第二个共振被激发;作为转折点,截面长宽比例约为2.2的电介质柱不能激发磁共振模式.结果还表明改变电磁波入射方向可以调节长方形截面的电介质柱的磁共振发生的频率位置,实现偏振可控的电磁响应,这为新颖的电介质电磁超介质的设计与研究提供有价值的信息.Dielectric resonator is a kind of important building block for metamaterials.Here,we numerically investigated the resonance modes excited in the dielectric resonator whose cross section has different ratios of the length to width.It is found that the cross-sectional aspect ratio has great influence on the excitation sequence of the resonance modes.The magnetic resonance mode is firstly excited for the aspect ratio smaller than 2.2,whereas it is excited at the second resonance for the ratio lager than 2.2.As the turning point,i.e.with the aspect ratio of 2.2,the magnetic mode cannot be achieved.The calculations also show that the magnetic resonance can be tuned by adjusting the direction of the incident electromagnetic wave,thus achieving the polarization control of electromagnetic response.This study provides valuable information for the design and research of novel dielectric-based metamaterials.

关 键 词：电介质 电磁超介质 共振 

分 类 号：O441.4[理学—电磁学]