Abstract

The spectra of light reflection by plasmonic metal films deposited in vacuum on dielectric substrates and subsequently annealed at high temperatures are investigated. To explain the optical properties of plasmonic films, a theoretical model of a plane-layered metal-dielectric medium is used. One of the layers of such a structure has the dielectric constant of the metal under study, and the second layer has the dielectric constant calculated within the Maxwell-Garnett approximation for a heterogeneous medium consisting of a suspension of metallic nanoellipsoids in air. The introduction of this layer makes it possible to qualitatively take into account the inhomogeneities of the plasmon film surface. It is shown that the developed model allows a number of features in the experimental reflection spectra to be explained.

中文翻译：

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金和银等离子电影的光反射：实验和理论的比较

摘要

研究了在真空中沉积在介电基片上并随后在高温下退火的等离子体金属膜的光反射光谱。为了解释等离激元薄膜的光学特性，使用了平面层金属介电介质的理论模型。这种结构的一层具有所研究金属的介电常数，第二层具有在麦克斯韦-加纳特近似值下计算的由金属纳米椭圆体在空气中悬浮的非均质介质的介电常数。该层的引入使得可以定性地考虑等离激元膜表面的不均匀性。结果表明，开发的模型可以解释实验反射光谱中的许多特征。