复合纳米颗粒膜的有效极化率研究

应用复合二元颗粒材料的空间平均电场、平均电位移之间的关系及复合介质的非线性光学性质,表示出复合介质的有效介质函数εe=F(ε_1,ε_2,f1).假设在线性极限下第I组份的ε_I(I=1,2)为常数时,应用微扰理论,导出了复合介质的非线性有效极化率x_e,该结果与MG近似理论和EMA近似理论比较应用范围更广.用该理论对Cu纳米颗粒嵌入(SiO_2)基质中组成Cu-SiO_2薄膜进行相应分析,其结果与Hamanaka的实验结果相吻合.

The research of effective susceptibilities on metal-insulator composites media films

In this paper, by means of the nonlinear relation between average electric field and average electric displacement and of the nonlinear optical properties, the dielectric function ε_e = F(ε_1 ,ε_2,f_1)of binary-composites material is given. In the case that the imaginary ε_i(i=1,2) of ith component is constant, the expressions of effective nonlinear susceptibilities are derived from perturbation theory.The results offer a rather general formulation of the problem, and show that this enhancement exists in a wide variety of cases than those obtained from MG approximation theory and EMA theory. As an example, the theoretical analyze using the above general formulation in Grain Films with Cu embed(SiO_2) matrix is carried out. It is found that the theoretical result is consistent with the Hamanaka's experimental result.