基于双鱼网结构的可见光波段超材料

基于双鱼网左手模型的思想,使用模板辅助化学电沉积的方法制备出不同结构周期的金属银纳米网格,并进一步实现了可见光波段的双鱼网结构超材料.随着结构周期的减小,金属银纳米网格透射通带位置出现蓝移.使用周期为420 nm的金属银纳米网格组装成双鱼网结构,样品在610 nm处出现透射增强及平板聚焦效应.倘若使用结构周期更小的模板,有望实现更短波长,甚至蓝光波段的双鱼网结构超材料. 关键词： 超材料 双鱼网结构 可见光 平板聚焦

Visible light metamaterials based on the double-fishnet structure

A novel method was proposed to fabricate double-fishnet structure metamaterials working at visible frequencies. Via template-assisted electrochemical deposition, silver nanonets with different lattices were fabricated, which were used to achieve final double-fishnet structures. It was revealed that the passband of the silver nanonet structure was shift to shorter wavelength when changing the lattice of structure smaller, according to the transmission spectra. Silver nanonet with lattice of 420 nm was used to achieve double-fishnet structure, which has novel effects at 610 nm wavelength, such as enhanced transmission and planar focusing. Furthermore, it is possible to fabricate double-fishnet structure metamaterials working at shorter wavelengths even for blue light when using template with smaller lattice.