拓扑绝缘体对表面等离子体激元的调控研究

发布时间：2018-01-19 05:33

本文关键词： 拓扑绝缘体表面等离子体激元 Bi_2Se_3 共振调控　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：拓扑绝缘体是一种全新的量子电磁功能材料,具有绝缘性体能带结构和受时间反演对称性保护的自旋分辨的金属表面态。这样的特性使得拓扑绝缘体一经问世就引起了全世界的广泛关注,在量子计算、自旋电子器件、太赫兹探测等方面具有广泛应用前景。随着拓扑绝缘体(Bi2Se3)表面等离子体激元的存在性在实验中得到证实,拓扑绝缘体有望应用于下一代光电集成器件中。对拓扑绝缘体表面等离子体激元特性的研究尤其是对其特性的调控研究,成为人们关注的焦点和热点。然而,目前对拓扑绝缘体表面等离子体激元调控方面的研究还处于起步阶段。本文在对前人工作深入调研的基础上,首先研究了拓扑绝缘体的表面电导率和等效介电常数,并在此基础上分析拓扑绝缘体表面等离子体激元的特性。接着,围绕拓扑绝缘体对表面等离子体激元的调控进行了深入研究,为进一步研究拓扑绝缘体表面等离子体激元的应用做了较好的铺垫。论文的主要研究工作包含以下几个方面：(1)介绍拓扑绝缘体的特点、发展及国际研究现状,尤其是拓扑绝缘体表面等离子体激元领域的研究现状。(2)研究拓扑绝缘体表面等离子体激元的特性。首先分析了在拓扑绝缘体表面带隙打开条件下拓扑绝缘体的表面电导率,然后推导出拓扑绝缘体表面等效介电常数。最后,基于拓扑绝缘体的表面电导率,结合拓扑绝缘体表面的特殊金属性,分析了在拓扑绝缘体表面带隙打开条件下其表面等离子体激元的特性。(3)研究拓扑绝缘体对表面等离子体激元共振的调控。首先给出了拓扑绝缘体条带周期结构的数值建模方法,然后用此方法研究了拓扑绝缘体条带周期结构的表面等离子体共振特性,并且将仿真结果与文献中的实验结果进行比较,验证数值建模方法的正确性。最后基于前面的数值建模方法进一步研究分析拓扑绝缘体圆盘周期结构对表面等离子体激元共振频率及幅度的调控。
[Abstract]:Topological insulator is a new quantum electromagnetic functional material. With the insulative physical band structure and the spin resolved metal surface states protected by time-inversion symmetry, the topological insulators have attracted worldwide attention once they were born, and have attracted much attention in quantum computation. Spin electronic devices, terahertz detection and so on have wide application prospects. The existence of surface plasmon exciters of topological insulator Bi2Se3 has been proved by experiments. Topological insulators are expected to be used in the next generation of optoelectronic integrated devices. The study of the characteristics of topologically insulator surface plasmas, especially the regulation of their characteristics, has become the focus and focus of attention. At present, the study of topologically insulator surface plasmon regulation is still in its infancy. Firstly, the surface conductivity and equivalent dielectric constant of topological insulators are studied, and the characteristics of surface plasmon excitators of topological insulators are analyzed. The control of surface plasma excitators by topological insulators is studied in detail. In order to further study the application of topological insulator surface plasmon, the main work of this paper includes the following aspects: 1) introduce the characteristics of topological insulator. Current status of development and international research. In particular, the research status in the field of topologically insulator surface plasmon. The characteristics of topological insulator surface plasmon are studied. Firstly, the surface conductivity of topological insulator is analyzed under the condition of band-gap opening. Then the equivalent dielectric constant of the topological insulator surface is derived. Finally, based on the surface conductivity of the topological insulator, combined with the special gold properties of the topological insulator surface. The characteristics of the surface plasma excitators of topological insulators under the condition of band-gap opening on the surface of topological insulators are analyzed. The control of surface plasmon resonance by topological insulators is studied. Firstly, a numerical modeling method for the periodic structure of the strip is presented. Then the surface plasmon resonance (SPR) characteristics of the striped periodic structure of the topological insulator are studied, and the simulation results are compared with the experimental results in the literature. Finally, based on the previous numerical modeling method, the control of the frequency and amplitude of the surface plasmon resonance by the periodic structure of the topological insulator disk is further studied.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34

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