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A comprehensive optical analysis of nanoscale structures: from thin films to asymmetric nanocavities

机译：纳米级结构的综合光学分析：从薄膜到不对称纳米覆盖

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摘要

A simple and robust method able to evaluate and predict, with high accuracy, the optical properties of single and multi-layer nanostructures is presented. The method was implemented using a COMSOL Multiphysics simulation platform and it has been validated by four case studies with increasing numerical complexities: (i) a single thin layer (20 nm) of Ag deposited on a glass substrate; (ii) a metamaterial composed of five bi-layers of Ag/ITO (indium tin oxide), with a thickness of 20 nm each; (iii) a system based on a three-material unit cell (AZO/ITO/Ag), but without any thickness periodicity (AZO stands for Al2O3/zinc oxide); (iv) an asymmetric nanocavity (thin-ITO/Ag/thick-ITO/Ag). A thorough study of this latter configuration reveals peculiar metamaterial effects that can widen the actual scenario in nanophotonic applications. Numerical results have been compared with experimental data provided by real ellipsometric measurements performed on the above mentioned ad hoc fabricated nanostructures. The obtained agreement is excellent, suggesting this research as a valid design approach to realize multi-band metamaterials able to work in a broad spectral range.
机译：提出了一种能够评估和预测的简单且鲁棒的方法，以高精度地提出单层和多层纳米结构的光学性质。该方法是使用COMSOL多发性仿真平台实施的，并且通过四个案例研究验证了数值复杂性：（i）沉积在玻璃基板上的单个薄层（20nm）的Ag; （ii）由五个双层的AG / ITO（氧化铟锡）组成的超材料，厚度为20nm; （iii）基于三重单元电池（AZO / ITO / AG）的系统，但没有任何厚度周期（AZO代表Al2O3 /氧化锌）; （iv）不对称纳米橄榄球（薄ITO / AG /厚ITO / AG）。对后一构造的彻底研究揭示了可以扩大纳米光电应用中的实际情况的特殊的超材料效应。已经将数值结果与通过在上述ad Hoc制造的纳米结构上进行的实际椭圆测量测量提供的实验数据进行了比较。获得的协议很好，这表明这项研究是实现能够在广谱范围内工作的多频带超材料的有效设计方法。

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  • 来源
    《RSC Advances》 |2019年第37期|共9页
  • 作者

    Lio Giuseppe Emanuele; Palermo Giovanna; Caputo Roberto; De Luca Antonio;

  • 作者单位

    Univ Calabria Cosenza &

    Phys Dept CNR Nanotec I-87036 Arcavacata Di Rende CS Italy;

    Univ Calabria Cosenza &

    Phys Dept CNR Nanotec I-87036 Arcavacata Di Rende CS Italy;

    Univ Calabria Cosenza &

    Phys Dept CNR Nanotec I-87036 Arcavacata Di Rende CS Italy;

    Univ Calabria Cosenza &

    Phys Dept CNR Nanotec I-87036 Arcavacata Di Rende CS Italy;

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  • 正文语种 eng
  • 中图分类 化学;
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