新型光频超材料的建模与仿真研究

发布时间：2021-11-27 08:47

　　超材料是一类人工材料,它经过工程设计后可以产生某些在自然状态下不会出现的特殊性质。超材料通常用某些复合材料经过精心设计成不同的结构单元后组装而成,这些复合材料包括塑料和金属,通常以周期性重复的方式进行组织,其尺寸通常小于所考虑的波长。超材料经过精心设计通常能够影响电磁波或声波,而且超材料的这种影响方式在体材料中并不多见。超材料的折射率对于特定的波长可以为负值,因而这类材料也被称之为负折射率超材料,这一特性引起了人们的广泛关注。本文主要对超材料的一些新型结构进行研究,并探索具有负折射率的新型材料单元,以期在光谱范围内（特别是在可见光区）能获得负的介电常数、磁导率或者折射率。论文的主要工作和研究成果如下:（1）提出了一类核-壳金属介电结构,在可见光范围内具有各向同性负折射率。该结构由两个纳米球（核和壳）组成,本文中选择的材料是木材、油和银金属。在这类结构中,发现油壳银核、木壳银核、银壳木核和油壳木核在可见光下均展现出负折射率。油壳银核纳米颗粒在550nm-680nm波长范围内具有较高的透射率;换句话说,我们认为它对黄色和橙色透射率较高是可以作为滤波器应用的。对于木壳银核纳米颗粒,分析表明,... 

【文章来源】：华中师范大学湖北省 211工程院校 教育部直属院校

【文章页数】：115 页

【学位级别】：博士

【文章目录】：
摘要
Abstract
1 Introduction
    1.1 Light and color
    1.2 Metamaterials and its history
        1.2.1 Development of structured materials
        1.2.2 The history of metamaterials
        1.2.3 Effective parameters of metamaterials
        1.2.4 Wave Propagation in Left-Handed Media
        1.2.5 An early demonstration of negative refractive index metamaterial
    1.3 Latest advanced research in metamaterial
    1.4 Dissertation outline
2 Basic theories and experimental techniques
    2.1 The optical behavior of the fundamental constituents of metamaterials
        2.1.1 Optical materials and electronic structures
        2.1.2 Dielectric and optical properties
        2.1.3 Optical properties of metals
        2.1.4 Metal-dielectric composites
        2.1.5 Electric metamaterials
        2.1.6 Magnetic metamaterials
    2.2 Simulation tools and experiments techniques
    2.3 Experimental techniques for optical metamaterial
        2.3.1 Fabrication of 2D optical metamaterial
        2.3.2 Fabrication of 3D optical metamaterial
        2.3.3 Other techniques for 3D metal-dielectric structures
    2.4 Summary
3 Dielectric-Metal Nanoshell Plasmonic Metamaterial for Filtering and Protection
    3.1 Silver core covered with oil shell nanoparticles
    3.2 Wood shell coated silver core nanoparticles
    3.3 Silver shell coated wood core nanoparticles
    3.4 Oil shell coated wood core nanoparticles
    3.5 Summary
4 Metamaterials side of mercury metal at the visible light range
    4.1 Transmission, Reflectance and Absorption characteristics
    4.2 Effect of the radius of the nanowire on the behavior of the material
    4.4 Summary
5 Metamaterial properties of epoxy resins nanospheres at visible light
    5.1 Permittivity, permeability, and negative refractive index properties
    5.2 Transmission, Reflectance and Absorption characteristics
    5.3 Negative refractive index in nanoparticles layer at the visible
    5.4 Summary
6 Circular dichroism in a chiral metamaterial
    6.1 Some elements of stereochemistry
    6.2 Chiral metamaterial
    6.3 Chirality parameter and ellipticity
    6.4 Circular dichroism numerical simulation in a chiral metamaterial
    6.5 Summary
7 Conclusion and future work
References
Publications
Acknowledgements
Appendix



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