【摘要】 研究了退极化因子对金属－绝缘体复合介质中的线性光学吸收和非线性极化度的影响．利用退耦近似和谱表式相结合的方法研究退极化因子对有效非线性响应的影响，结果显示线性吸收系数和有效非线性极化率与颗粒的形状（对应退极化因子）有很大依赖关系。更多还原

【Abstract】 The effects of depolarization factor on the optical properties including effective linear optical absorption and nonlinear susceptibility in the metal dielectrics composite media are investigated. A type of microstructures corresponding to those described by Effective Medium Approximation (EMA) are examined. By using decoupling approximation and spectral representation, we investigate the effect of the depolarization factor on effective nonlinear response. Numerical results show that the linear ab- sorption coefficient and the effective nonlinear susceptibility are strongly dependent on the depolariza- tion factor and thus on the shape of the inclusion.更多还原