Metamaterials with dendriticlike structure at infrared frequencies

The authors present a planar medium composed of the copper dendriticlike structure and silver film at infrared frequencies. The dendriticlike copper, which has quasiperiodic hexagonal cells, and silver film were prepared using the electrochemical deposition method. It is shown that the transmission spectra of the copper dendriticlike structure and the planar medium appear to have a stop band and a passband in the range of 1.28-2.5 μm. A clear image is also observed at the wavelength near 1.92 μm, as expected, with our lens composed of copper dendritic cells and silver film.