可见光波段超材料的平面聚焦效应

基于超材料双鱼网结构物理模型,设计了树枝状结构+树枝状结构、树枝状结构+银膜和树枝状结构+氧化铟锡玻璃三种可见光波段超材料复合结构.采用双模板辅助化学电沉积方法,制备出金属银树枝状结构阵列和银膜,分别实现了这三种复合结构.透射和反射实验表明,三种复合结构具有类似的行为.比较发现,树枝状结构+氧化铟锡玻璃复合结构具有损耗低和平面聚焦效应明显的优点.通过调节实验条件,分别制备出能够实现平面聚焦的红绿蓝三种可见光波段超材料. 关键词： 超材料 银树枝状结构 可见光 平面聚焦

Planar focus effect of visible light metamaterials

In this paper are described three composite structures of visible light metamaterials, i.e. dendritic structures and dendritic structures, dendritic structures and silver film, dendritic structures and indium tin oxide slice, based on the physical model of "double-fishnet" structure. By double template-assisted electrochemical deposition, silver dendritic structure arrays and silver films are fabricated, which is useful for achieving the above three composite structures. It is revealed that all of the three composite structures have the same effects according to the transmission spectra and reverberation spectra. A comparison among all of the three composite structures clealy shows that the composite structure of dendritic structures and indium tin oxide slice has the best performance, such as low loss and distinct planar focus effect. Through adjusting the experiment conditions, three kinds of visible light metamaterials are prepared which can realize planar focus effects at red, green and blue light frequencies, separately.