本文關鍵詞： 拓撲絕緣體 表面等離子體激元 Bi_2Se_3 共振調控　出處：《東南大學》2015年碩士論文　論文類型：學位論文

【摘要】：拓撲絕緣體是一種全新的量子電磁功能材料,具有絕緣性體能帶結構和受時間反演對稱性保護的自旋分辨的金屬表面態(tài)。這樣的特性使得拓撲絕緣體一經(jīng)問世就引起了全世界的廣泛關注,在量子計算、自旋電子器件、太赫茲探測等方面具有廣泛應用前景。隨著拓撲絕緣體(Bi2Se3)表面等離子體激元的存在性在實驗中得到證實,拓撲絕緣體有望應用于下一代光電集成器件中。對拓撲絕緣體表面等離子體激元特性的研究尤其是對其特性的調控研究,成為人們關注的焦點和熱點。然而,目前對拓撲絕緣體表面等離子體激元調控方面的研究還處于起步階段。本文在對前人工作深入調研的基礎上,首先研究了拓撲絕緣體的表面電導率和等效介電常數(shù),并在此基礎上分析拓撲絕緣體表面等離子體激元的特性。接著,圍繞拓撲絕緣體對表面等離子體激元的調控進行了深入研究,為進一步研究拓撲絕緣體表面等離子體激元的應用做了較好的鋪墊。論文的主要研究工作包含以下幾個方面：(1)介紹拓撲絕緣體的特點、發(fā)展及國際研究現(xiàn)狀,尤其是拓撲絕緣體表面等離子體激元領域的研究現(xiàn)狀。(2)研究拓撲絕緣體表面等離子體激元的特性。首先分析了在拓撲絕緣體表面帶隙打開條件下拓撲絕緣體的表面電導率,然后推導出拓撲絕緣體表面等效介電常數(shù)。最后,基于拓撲絕緣體的表面電導率,結合拓撲絕緣體表面的特殊金屬性,分析了在拓撲絕緣體表面帶隙打開條件下其表面等離子體激元的特性。(3)研究拓撲絕緣體對表面等離子體激元共振的調控。首先給出了拓撲絕緣體條帶周期結構的數(shù)值建模方法,然后用此方法研究了拓撲絕緣體條帶周期結構的表面等離子體共振特性,并且將仿真結果與文獻中的實驗結果進行比較,驗證數(shù)值建模方法的正確性。最后基于前面的數(shù)值建模方法進一步研究分析拓撲絕緣體圓盤周期結構對表面等離子體激元共振頻率及幅度的調控。
[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.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB34

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相關碩士學位論文 前1條

1 顧曉鳳;拓撲絕緣體對表面等離子體激元的調控研究[D];東南大學;2015年

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