复合纳米颗粒膜的有效极化率研究

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

应用复合二元颗粒材料的空间平均电场〈E>、平均电位移〈D〉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ε_e=F(ε_1,ε_2,f_1).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χ_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.

In this paper, by means of the nonlinear relation between average electric field （E） and average electric displacement （D） and of the nonlinear optical properties, the dielectric function er=F（ε1,ε2,f1） of binary-composites material is given. In the case that the imaginary εi（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 ex- ample, the theoretical analyze using the above general formulation in Grain Films with Cu embed（SiO2） matrix is carried out. It is found that the theoretical result is consistent with the Hamanaka＇s s experimental result.