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 multiband left-handed metamaterial 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, leading to the spatial separation of its spectrum,i.e.trapped rainbow effect.
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