颗粒球由于Mie谐振而使其复合材料能够在较高频段具有各向同性负折射效应,本文以Ag或Ge球形颗粒或Ge包覆Ag颗粒构成的包覆层颗粒分散于LiTaO3基体介质中构成的几种复合介质为研究对象.基于Mie理论和有效介质理论计算表征电磁波与颗粒复合材料相互作用过程的等效光学常数,分析这几种类型介质的负折射现象;基于建立的光学常数模型和电磁理论模拟了这几类复合介质的吸收特性,通过与在正折射频段的比较,分析其在负折射频段的辐射吸收机理.
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