梯度界面层对复合材料有效光学性质的影响  

Effect of graded interface on effective optical properties of composite media

作　　者：谢秉川[1] 何勤[1] 沈廷根[1] 

机构地区：[1]江苏大学理学院物理系,江苏镇江212013

出　　处：《强激光与粒子束》2008年第9期1563-1566,共4页High Power Laser and Particle Beams

基　　金：江苏省自然科学基金项目(BK2004059)

摘　　要：研究了球形颗粒被无规地浸没在基质中,具有梯度分界面和光滑分界面的球形颗粒复合物界面层对介电响应和光学性质的影响;利用第一原理近似,计算了在稀释极限下具有梯度分布界面层复合物的有效介电常数,讨论了其实部和吸收光谱随外加场频率的变化关系。对结果进行比较,发现梯度分布的界面层使复合材料在等离子体共振频率处的有效介电常数的涨落明显减小,吸收谱线明显宽化并伴有"蓝移"现象,梯度界面层能很好地控制等离子体共振和减小有效介电响应的涨落。Interfacial effect on effective optical properties of a granular composite has been investigated, in which spherical particles with graded interfaces are randomly embedded in a host matrix. Under the dilute limit, the effective dielectric coefficient of the composite is derived by means of the first-principle approach method applied to power-law dielectric gradation profile in interfaces. The effective optical responses of graded and sharp interfaces are discussed, respectively. It is found that the graded interface in graded spherical particles yields a broader optical absorption spectrum with blue-shift and the fluctuation of corresponding effective dielectric response is smaller.

关 键 词：界面效应 梯度界面层 复合材料 光学吸收谱 有效介电响应 

分 类 号：O431.1[机械工程—光学工程]