采用平板电极化学电沉积的方法，通过调节实验参量，在柔性ITO导电薄膜基底上制备了尺度与红外波长匹配、结构单元大小不等、排列无序的银树枝状结构.通过调节聚乙二醇-20000浓度可以很好地调控银树枝状结构单元的形貌和尺寸，研究发现，在一定范围内增加电解液中的聚乙二醇-20000浓度，可在基底上形成分布较密、分枝较细、分枝级数较高的银树枝状结构单元.通过在银树枝状结构表面涂覆一定厚度的聚乙烯醇作为绝缘层，组装成了柔性“三明治”结构复合材料，测试得到样品在红外波段的多通带透射谱，平板聚焦实验进一步验证了样品的左手效应.

Random structures of silver dendriticlike cells, with the scale matching with infrared wavelengths, are prepared on the flexible conductive ITO film substrate, using the electrochemical deposition method by adjusting the experimental parameters. It is shown that the geometry of the silver dendriticlike structure can be fine-tuned by changing the concentration of PEG-20000, and, within certain limits, the branches of the silver dendriticlike structure get more exiguous with increasing PEG-20000 concentration. As a dielectric spacer, a PVA film with a certain-scale thickness is prepared and located on the silver dendriticlike cells by a vertical lifting deposition method. And a sandwich structural composite material is fabricated. The multiple passbands of infrared transmission spectra of the samples are gained, and left-handed effect is validated using a further slab focusing experiment.