494 / 2018-12-31 12:34:19

金属颗粒弥散结构超材料的光学特性研究

超材料，表面等离激元共振，弥散结构，时域有限差分法

全体主题 > 纳米传热、纳米流体流动和纳米材料

超材料是指一些具有天然材料所不具有的超常性质的人造材料。金属纳米颗粒和基质材料可以通过一定方法复合形成具有弥散结构的人造材料。在一定的入射光场下，金属纳米颗粒会发生局域表面等离激元共振现象。金属纳米颗粒和基质材料的复合作用及协同作用会使新的材料具有特殊的光学性能。改变金属纳米颗粒的种类及其在基质中的体积分数，结合有效介质理论和时域有限差分法对弥散结构材料的光学特性进行分析和计算，得到不同条件下弥散结构材料的场强分布及在一定波长入射光照射下的吸收率、反射率等光学性能。研究结果表明，金属纳米颗粒种类的改变对弥散结构薄膜的吸收率、反射率有一定的影响。金属纳米颗粒体积分数的改变对复合结构材料的光学性质也有较大影响。
Study on Optical Properties of Metal Particle Dispersive Metamaterials
Metamaterials are man-made materials that have extraordinary properties that are not found in natural materials. Metal nanoparticles and matrix materials can be composited by certain methods to form man-made materials with a dispersed structure. Localized surface plasmon resonance occurs in metal nanoparticles under a certain incident light field. The composite effect and synergistic effect of metal nanoparticles and matrix materials can make new materials have special optical properties. The optical properties such as field strength distribution, absorptance and reflectance of the dispersed structure were analyzed and calculated through the effective medium theory and the finite difference time domain method by change the type of metal nanoparticles and its volume fraction in the matrix. The results show that the change of metal nanoparticles has a certain influence on the absorption rate and reflectance rate curve. The change of the volume fraction of metal nanoparticles also has a great influence on the optical properties of the composite structure film.
Key words: metamaterials, LSPR, dispersion structure, FDTD