Blue-green-red light left-handed metamaterials from disorder dendritic cells

We demonstrate a visible light frequency left-handed metamaterial (LHM) composed of disorder dendritic cells and a novel bottom-up approach to fabricate the LHM using double template assisted electrochemical deposition method. When the diameters of the cells and the width of the second dendrite is about 500-700 nm and 30-120 nm, the as-prepared silver dendritic structural array appears a passband at wavelength of 470, 510 and 610 nm, respectively. The whole left-handed resonance behavior will not be affected greatly for cell variations below ±7 %. The LHM may realize the slab focusing effect at blue, green and red light wavelength, the focused point image with intensity 10 % higher than light source. It would be significant to accelerate the development of visible frequency LHMs.