核-壳结构纳米线表面界面的电磁散射研究.doc
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核-壳结构纳米线表面界面的电磁散射研究,核-壳结构纳米线表面/界面的电磁散射研究electromagnetic scattering at surface/interface of core-shell nanowires 15000字38页目录目录1摘要2abstract3第1章 绪论41.1 引言41.2 纳米线简介41.3纳米线的光学性质51.3.1紫...
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核-壳结构纳米线表面/界面的电磁散射研究
Electromagnetic scattering at surface/interface of Core-shell nanowires
15000字 38页
目录
目录 1
摘要 2
Abstract 3
第1章 绪论 4
1.1 引言 4
1.2 纳米线简介 4
1.3纳米线的光学性质 5
1.3.1紫外-可见光吸收特性 5
1.3.2 光致发光 6
1.3.3 纳米线光学性质的研究方法简介 8
1.4 光散射理论的发展简介 10
第2章 光散射理论 12
2.1 引言 12
2.2 散射理论基础 13
2.2.1麦克斯韦方程组 13
2.2.2 光波与介质相互作用 14
2.2.3 散射相关的基本物理量 16
2.3 光散射理论 18
2.3.1 线性散射 18
2.3.2非线性散射 19
2.3.3 光散射理论的应用 19
2.4 Mie 散射公式 21
2.4.1 光散射矢量波描述 21
2.4.2 球形颗粒Mie 散射公式 22
第3章 核壳结构纳米线的电磁散射 26
3.1 引言 26
3.2 核壳纳米线的电磁散射研究 27
3.3 总结 32
致谢 33
参考文献： 34
摘要
摘要 亚波长纳米结构中的光散射研究在许多领域有着重要应用，如在光通信，气象，传感中的应用，以及医学和生物学等其他学科领域的研究。金属核与高介电常数的壳组成的核壳结构纳米线因其特殊的结构而具有特殊的光学和电学性质，本文将主要研究核-壳结构的纳米线的电磁散射。
本文首先简单的介绍了光散射的发展，核-壳结构纳米线的制备以及性质等；介绍了纳米线的光学性质，包括纳米线的紫外-可见光吸收特性，光致发光等。然后详细介绍了光散射的基础理论及基本原理。主要研究了垂直入射波下核-壳结构纳米线表面的电磁散射。对于p偏振光入射波下的纳米线，每个电谐振对应于两个简并散射波段，而磁谐振只对应一个波段。因此，当电偶极子(ED)和磁偶极子(MD)被调谐到光谱重叠时，ED的幅度是MD的两倍，产生了一对散射消失角。我们还进一步表明，纳米线的散射特性是偏振相关的，并且散射消失角也是通过高阶电动模式与宽MD模式的干扰而引起的Fano共振产生。
关键词 核壳结构 纳米线 光散射 电磁散射
Abstract
Abstract Light scattering by subwavelength nanostructures play a fundamental role in many fields, such as optical communications, meteorology, sensing, medical and biological research, and other interdisciplinary fields. Core-shell nanowires consisting of metal core with a high dielectric constant shell posssess particular optical and electrical properties, duo to their special structure characteristics. In this work, we studied the scattering of (metal) core-shell (high-permittivity dielectric) nanowires, which support both electric and magnetic resonances.
At first，We briefly reviewed the development of light scattering, the preparation of core-shell nanowire structure and the properties of core-shell nanowires. We focus on the optical properties of nanowires, including ultraviolet-visible light absorption properties, photoluminescence behavior etc. Secondly, the thesis reviewed the basic principle and theory of light scattering. We study the scattering of normally incident waves by core-shell nanowires, which support both electric and magnetic resonances. Within such nanowires, for p-polarized incident waves, each electric resonance corresponds to two degenerate scattering channels while the magnetic resonance corresponds to only one channel. Consequently, when the electric dipole (ED) and magnetic dipole (MD) are tuned to overlap spectrally, the magnitude of the ED is twice that of the magnetic one, leading to a pair of angles of vanishing scattering. We further demonstrate that the scattering features of nanowires are polarization dependent, and vanishing scattering angles also can be induced by Fano resonances due to the interference of higher-order electric modes with the broad MD mode.
Key words core-shell, nanowires, scattering of light, electromagnetic scattering
Electromagnetic scattering at surface/interface of Core-shell nanowires
15000字 38页
目录
目录 1
摘要 2
Abstract 3
第1章 绪论 4
1.1 引言 4
1.2 纳米线简介 4
1.3纳米线的光学性质 5
1.3.1紫外-可见光吸收特性 5
1.3.2 光致发光 6
1.3.3 纳米线光学性质的研究方法简介 8
1.4 光散射理论的发展简介 10
第2章 光散射理论 12
2.1 引言 12
2.2 散射理论基础 13
2.2.1麦克斯韦方程组 13
2.2.2 光波与介质相互作用 14
2.2.3 散射相关的基本物理量 16
2.3 光散射理论 18
2.3.1 线性散射 18
2.3.2非线性散射 19
2.3.3 光散射理论的应用 19
2.4 Mie 散射公式 21
2.4.1 光散射矢量波描述 21
2.4.2 球形颗粒Mie 散射公式 22
第3章 核壳结构纳米线的电磁散射 26
3.1 引言 26
3.2 核壳纳米线的电磁散射研究 27
3.3 总结 32
致谢 33
参考文献： 34
摘要
摘要 亚波长纳米结构中的光散射研究在许多领域有着重要应用，如在光通信，气象，传感中的应用，以及医学和生物学等其他学科领域的研究。金属核与高介电常数的壳组成的核壳结构纳米线因其特殊的结构而具有特殊的光学和电学性质，本文将主要研究核-壳结构的纳米线的电磁散射。
本文首先简单的介绍了光散射的发展，核-壳结构纳米线的制备以及性质等；介绍了纳米线的光学性质，包括纳米线的紫外-可见光吸收特性，光致发光等。然后详细介绍了光散射的基础理论及基本原理。主要研究了垂直入射波下核-壳结构纳米线表面的电磁散射。对于p偏振光入射波下的纳米线，每个电谐振对应于两个简并散射波段，而磁谐振只对应一个波段。因此，当电偶极子(ED)和磁偶极子(MD)被调谐到光谱重叠时，ED的幅度是MD的两倍，产生了一对散射消失角。我们还进一步表明，纳米线的散射特性是偏振相关的，并且散射消失角也是通过高阶电动模式与宽MD模式的干扰而引起的Fano共振产生。
关键词 核壳结构 纳米线 光散射 电磁散射
Abstract
Abstract Light scattering by subwavelength nanostructures play a fundamental role in many fields, such as optical communications, meteorology, sensing, medical and biological research, and other interdisciplinary fields. Core-shell nanowires consisting of metal core with a high dielectric constant shell posssess particular optical and electrical properties, duo to their special structure characteristics. In this work, we studied the scattering of (metal) core-shell (high-permittivity dielectric) nanowires, which support both electric and magnetic resonances.
At first，We briefly reviewed the development of light scattering, the preparation of core-shell nanowire structure and the properties of core-shell nanowires. We focus on the optical properties of nanowires, including ultraviolet-visible light absorption properties, photoluminescence behavior etc. Secondly, the thesis reviewed the basic principle and theory of light scattering. We study the scattering of normally incident waves by core-shell nanowires, which support both electric and magnetic resonances. Within such nanowires, for p-polarized incident waves, each electric resonance corresponds to two degenerate scattering channels while the magnetic resonance corresponds to only one channel. Consequently, when the electric dipole (ED) and magnetic dipole (MD) are tuned to overlap spectrally, the magnitude of the ED is twice that of the magnetic one, leading to a pair of angles of vanishing scattering. We further demonstrate that the scattering features of nanowires are polarization dependent, and vanishing scattering angles also can be induced by Fano resonances due to the interference of higher-order electric modes with the broad MD mode.
Key words core-shell, nanowires, scattering of light, electromagnetic scattering
