Magnetic response of copper dendritic structures at infrared frequencies

A dendritic structure model is proposed for the realization of negative permeability at infrared wavelengths. The relationship between the dendritic geometry and the resonant wavelength is performed with the software package CST microwave studio based on the finite difference technology, and the negative permeability is realized at infrared wavelengths. Using a carbon fiber with the diameter about 5μm as the cathode, the copper dendritic structures are fabricated using the chemical electro-deposition method. The spatial infrared transmission behavior of samples is measured using a Fourier transform infrared spectroscopy, and the results shown that the magnetic response can be realized by the copper dendritic structures at infrared wavelengths with the maximum intensity about - 7.95dB. The experimental results are good agreement with the numerical simulation. The further experimental results shows that the fractal demission and magnetic response wavelength of the dendritic structure increased with the increase of the electro-deposition voltage, and the wavelength and intensity of the magnetic response changed in the case of the coupling effect of the two copper dendritic structures.