红外波段铜树枝状结构磁响应特性研究

Magnetic response of copper dendritic structures at infrared frequencies

提出一种可用于实现红外波段负磁导率的树枝状磁谐振模型,采用基于有限差分技术的CST微波工作室软件确定了树枝状结构参数与磁谐振响应之间的关系,实现了红外波段的负磁导率。以碳纤维为阴极,采用化学电沉积的方法制备了铜树枝状结构,利用傅立叶变换红外光谱仪测量了样品的空间红外透射行为,结果表明铜树枝状结构实现了红外波段的磁谐振响应,最大透过率达到-7.95dB,实验结果与数值模拟吻合。研究了铜树枝状结构的分形维数和磁响应波段与沉积电压的关系以及两个铜树枝状结构之间的耦合作用,结果表明随着沉积电压的增大分形维数与磁响应波长随之增加,样品之间的耦合作用导致磁谐振响应的波长和强度发生变化。

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 intensi- ty of the magnetic response changed in the case of the coupling effect of the two copper dendritic structures.