可见光波段超材料左手行为及左手异质结构捕获彩虹效应

Left-handed behaviors of optical metamaterial and trapped rainbow effect of left-handed heterostructure

基于自下而上的电化学沉积法,利用改进的工艺在一片ITO导电玻璃基底上制备双层银树枝多带光学左手材料,并测试其透射和平板聚焦行为。实验结果表明,样品在可见光波段出现3个透射通带,并且当入射光的波长为透射峰值波长时,在距离样品后表面半波长附近出现平板聚焦效应,充分证实了样品在可见光波段的左手行为。将两个相同的左手材料样品以一定的间距组合成一个左手异质结构,当一束复色光沿左手异质结构的中心线入射时,在左手异质结构中出现一条非常明亮的、由紫到红的彩色光带,表明不同波长的光在不同的位置停留下来,从而实现了光谱的空间分离,即捕获彩虹效应。

Based on the bottom up electrochemical deposition method,we prepare optical muhiband left-handed melamaterial with bilayer silver dendrite on a single ITO glass substrate by improved process. We test trans mission spectrum and planner focusing effect of sample. The experimental results verify the left-handed behav- ior. When a white light was incident along the central line of left-handed heterostructure,a bright color strip was obserbed. It was indicated that each frequency component was stopped at a different air core thickness, h：adin~ to the spatial separation of its spectrum,i.e, trapped rainbow effect.