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Magneto-Optic and Ellipsometric study of nanostructured media

纳米结构介质的磁光和椭偏研究

基本信息

批准号：
EP/I014004/1
负责人：
Ronald Atkinson
金额：
$ 56.13万
依托单位：
Queen's University Belfast
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FI014004%2F1
关键词：
Magneto Optic Ellipsometric study nanostructured

项目摘要

The proposed research is concerned with the fabrication of structured arrays of nanoscale tubes and rods composed of ferromagnetic materials. These will be prepared by recently developed techniques using the in-filling of cylindrical pores created by the anodisation of thin, sputter-deposited aluminium films. The manufacturing technique has been developed considerably in Belfast and given rise to media with exciting new optical properties. The anisotropic optical properties of the arrays will be investigated using variable angle, spectroscopic ellipsometry and reflectance and transmittance photometry. The objective will be to attempt to characterise the optical properties in terms of their fundamental complex permittivity tensor. The magnetic properties will be examined in terms of their hysteresis behaviour and this will be followed by a comprehensive examination of their magneto-optical effects. In particular we will refurbish an existing Kerr polarimeter to enable fully automatic collection of both complex Kerr (reflection) and Faraday (transmission) effects. This will enable us to assess the potential of the media for suitable applications and provide basic data on the magneto-optic parameters. An attempt will be made to characterise the materials in terms of the complex Voigt parameter and its variation with wavelength over a wide spectral range. It is hoped that the array design parameters will give control over their optical properties in a way that may make them suitable for magneto-optic enhancement to generate extra-large Kerr effects that may lead to improved devices for optical isolators and for the production of arrays of ultra-fast magneto-optic switches for future 3D/HD displays of the type used in cinemas and other public displays.Fundamental to the success of this project will be the accompanying theoretical modelling of the optical and magneto-optical properties of the nanostructures and their assembly in planar arrays. Significant progress has been made in this regard using modified effective medium theories specifically adapted to take into consideration the anisotropic nature of the medium. These effective medium theories will be extended to take into account the magneto-optical activity of the magnetic component/s of the structures and it is hoped that we will have similar success in explaining the observable linear, first-order, magneto-optical effects. In addition, we will also make use of a commercial (Comsol) Multiphysics Modelling and simulation package for modelling optical properties that is based upon finite element analysis and which has already proved very useful. It remains to be seen if this can be extended to deal with magneto-optical properties.

拟议的研究是关于由铁磁材料组成的纳米级管和棒的结构阵列的制造。这些将准备通过最近开发的技术，使用填充的圆柱形孔所产生的阳极氧化的薄，电镀沉积的铝膜。制造技术在贝尔法斯特得到了相当大的发展，并产生了具有令人兴奋的新光学特性的介质。阵列的各向异性光学特性将使用可变角度，椭圆偏振光谱和反射和透射光度法进行研究。我们的目标将是试图在其基本复介电常数张量的光学性质。磁性能将在其磁滞行为方面进行检查，这将是其次是一个全面的检查其磁光效应。特别是，我们将改造现有的克尔偏振计，使之能够全自动收集复克尔（反射）和法拉第（透射）效应。这将使我们能够评估合适的应用程序的媒体的潜力，并提供磁光参数的基本数据。尝试将在复杂的Voigt参数和它的变化与波长在一个很宽的光谱范围内的条款来解释的材料。希望阵列设计参数将以可以使它们适合于磁光增强以产生超大克尔效应的方式控制它们的光学性质，这可能导致用于光学隔离器的改进的设备和用于未来3D/3D超快速磁光开关阵列的生产。电影院和其他公共显示器中使用的高清显示器类型。该项目成功的基础将是伴随的光学和磁致伸缩的理论建模，纳米结构及其在平面阵列中的组装的光学性质。在这方面已经取得了重大进展，使用修改后的有效介质理论，特别适合考虑到各向异性性质的介质。这些有效介质理论将被扩展到考虑到磁组件/S的结构的磁光活动，并希望我们将有类似的成功解释可观察到的线性，一阶，磁光效应。此外，我们还将利用商业（Comsol）Multiphysics建模和模拟软件包，对基于有限元分析的光学特性进行建模，该软件包已被证明非常有用。这还有待观察，如果这可以扩展到处理磁光特性。