Nadal Elie, Barros Noémi, Glénat Hervé, Kachakachi Hamid
University of Perpignan Via Domitia (UPVD), 52 Avenue Paul Alduy, 66100 Perpignan, France.
Processes, Materials, and Solar Energy Laboratory, CNRS (PROMES-CNRS, UPR 8521), Rambla de la thermodynamique, 66100 Perpignan, France.
Materials (Basel). 2018 Feb 27;11(3):351. doi: 10.3390/ma11030351.
In this study we fabricate gold nanocomposites and model their optical properties. The nanocomposites are either homogeneous films or gratings containing gold nanoparticles embedded in a polymer matrix. The samples are fabricated using a recently developed technique making use of laser interferometry. The gratings present original plasmon-enhanced diffraction properties. In this work, we develop a new approach to model the optical properties of our composites. We combine the extended Maxwell-Garnett model of effective media with the Rigorous Coupled Wave Analysis (RCWA) method and compute both the absorption spectra and the diffraction efficiency spectra of the gratings. We show that such a semi-analytical approach allows us to reproduce the original plasmonic features of the composites and can provide us with details about their inner structure. Such an approach, considering reasonably high particle concentrations, could be a simple and efficient tool to study complex micro-structured system based on plasmonic components, such as metamaterials.
在本研究中，我们制备了金纳米复合材料并对其光学性质进行建模。这些纳米复合材料要么是均匀薄膜，要么是包含嵌入聚合物基质中的金纳米颗粒的光栅。样品是使用最近开发的利用激光干涉测量法的技术制备的。这些光栅呈现出独特的等离子体增强衍射特性。在这项工作中，我们开发了一种新方法来对我们复合材料的光学性质进行建模。我们将有效介质的扩展麦克斯韦 - 加尼特模型与严格耦合波分析（RCWA）方法相结合，计算了光栅的吸收光谱和衍射效率光谱。我们表明，这种半解析方法使我们能够重现复合材料的原始等离子体特征，并能为我们提供有关其内部结构的详细信息。考虑到相当高的颗粒浓度，这样一种方法可能是研究基于等离子体组件的复杂微结构系统（如超材料）的一种简单而有效的工具。
