左手材料的响应频段和单元尺寸关系的研究  

The relationship between resonant frequency band and cell size in left-handed materials

作　　者：吴俊芳[1,2] 孙明昭[2] 张淳民[2] 

机构地区：[1]西安工程大学理学院,西安710048 [2]西安交通大学理学院,西安710049

出　　处：《物理学报》2009年第6期3844-3847,共4页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:40537031);国家自然科学基金(批准号:40375010;60278019);陕西省教育厅科研基金(批准号:07JK261)资助的课题~~

摘　　要：目前左手材料的负折射现象只发生在微波波段,通常把发生负折射现象的这个频率波段称为响应频段.由于左手材料的响应频段的频率很低,而常用的波源是太阳光或者是可见光,因此左手材料的应用受到极大的限制.如何使左手材料的响应频段从低频移到高频或者说从微波波段移到可见光波段是迫切需要解决的问题.在周期性结构的左手材料中影响响应频段的因素很多,例如周期性结构的单元形状、单元尺寸等等.文中通过改变周期性结构左手材料的单元尺寸实现了响应频段的移动,同时经实验和计算机模拟得到了单元尺寸和响应频段的关系即随着单元尺寸变小响应频段从低频移动到高频,并且响应频段展宽了.By now, the negative refraction phenomenon occurs only in the microwave band in the left-handed materials, and this frequency band is called resonant frequency band. The application of the left-handed materials is greatly limited because the resonant frequency is low, and the source of wave is usually sun light or visible light. How to shift the resonant frequency from low frequency to high frequency, even to the visible light band, is an important and urgent research problem. Many parameters of the periodic structures will greatly affect the resonant frequency, including the shapes and sizes. The resonant frequency is shifted by adjusting the cell size. The relation that the resonant frequency band can be shifted and broadened from low frequency to high frequency with the reducing cell size, is obtained by simulation and experiment.

关 键 词：左手材料 周期性结构 单元尺寸 响应频段 

分 类 号：O482[理学—固体物理]