本文關(guān)鍵詞： 等離激元波導(dǎo) 波導(dǎo)耦合 非線性效應(yīng) 共振腔 石墨烯 泰伯效應(yīng) 光開關(guān)　出處：《青島大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：表面等離激元是指納米尺寸下由光波與金屬表面自由電子相耦合產(chǎn)生的在金屬-介質(zhì)界面?zhèn)鞑サ臋M磁電磁波,具有高模式體積的模式,能夠突破衍射極限,為實現(xiàn)納米量級尺寸下光操縱開拓了一種新途徑。同時石墨烯作為一種典型的二維材料,具有特殊的電學(xué)、光學(xué)等性質(zhì),太赫茲波段石墨烯可以激發(fā)表面等離激元,并且具有更強的約束能力和更低的損耗。本文分別以金屬、石墨烯為傳輸介質(zhì)設(shè)計了表面等離激元波導(dǎo)、圓盤諧振腔和陣列波導(dǎo),研究并分析了波導(dǎo)耦合特性、圓盤諧振特性以及周期成像等光學(xué)現(xiàn)象。本文主要的研究內(nèi)容如下:(1)介紹了表面等離激元的研究背景、研究現(xiàn)狀及其主要特性。(2)介紹了金屬的自由電子氣Drude模型、表面等離激元的激發(fā)方式,以及本論文研究工作中用到的研究方法:有限元算法,(3)設(shè)計了一種新型的球冠型混合等離激元波導(dǎo),研究了等離激元波導(dǎo)中的局域特性以及傳輸強度。研究結(jié)果表明所設(shè)計的混合型等離激元波導(dǎo)具有更強的局域性和較長的傳輸距離。(4)設(shè)計了一種帶有金屬帽的混合型表面等離激元波導(dǎo)結(jié)構(gòu),通過分析波導(dǎo)的有效面積Aeff、傳播長度Lp、非線性系數(shù)γ、非線性品質(zhì)因子F與波導(dǎo)參數(shù)及非線性材料的關(guān)系,得出所設(shè)計波導(dǎo)的最優(yōu)參數(shù)及最佳的非線性材料。(5)設(shè)計了一種含有兩個納米盤諧振腔的等離激元濾波器,根據(jù)圓盤共振理論以及波導(dǎo)耦合理論,分析了共振波長、傳輸效率與波導(dǎo)參數(shù)之間的關(guān)系,結(jié)果表明濾波器的共振波長可以通過圓盤直徑(r1、r2)調(diào)節(jié),傳輸效率可以通過波導(dǎo)與圓盤的間隔(d)調(diào)節(jié)。(6)簡要介紹了石墨烯特性,及其石墨烯表面等離激元的研究現(xiàn)狀。設(shè)計了一種新穎的石墨烯表面等離激元波導(dǎo)結(jié)構(gòu),分析了所設(shè)計波導(dǎo)的有效折射率、傳輸距離、截止波長與波導(dǎo)參數(shù)之間的關(guān)系,并在此基礎(chǔ)上設(shè)計了一種可調(diào)的光開關(guān)結(jié)構(gòu),分析了其傳輸性能,結(jié)果顯示所設(shè)計的光開關(guān)結(jié)構(gòu)在不同的費米能級下可以實現(xiàn)不同的開關(guān)狀態(tài)。(7)設(shè)計了一種石墨烯表面等離激元波導(dǎo)陣列結(jié)構(gòu),對其模式及傳播常數(shù)進行了詳盡的分析,并基于超模耦合理論引入陣列波導(dǎo)中不同高階模相加的理論,實現(xiàn)了石墨烯表面等離激元陣列中的泰伯效應(yīng),并從理論、模擬上詳細(xì)分析了石墨烯能級、波導(dǎo)間隔與泰伯距離之間的關(guān)系,研究結(jié)果表明仿真結(jié)果與理論計算一致,驗證了文中所提出的不同不同高階模相加理論。這對未來石墨烯在自成像領(lǐng)域具有很高的應(yīng)用價值。
[Abstract]:Surface isotherm is a transverse magnetic electromagnetic wave generated by coupling light wave with free electron on metal surface at nanometer size. It has a high mode volume mode and can break through the diffraction limit. As a typical two-dimensional material, graphene has special electrical and optical properties. Terahertz band graphene can excite surface isotherms. In this paper, we have designed the surface isobaric waveguide, disk resonator cavity and arrayed waveguide with metal and graphene as transmission media, and studied and analyzed the coupling characteristics of the waveguide. The main contents of this paper are as follows: (1) the research background of surface isopherons is introduced, and the present research status and its main characteristics. (2) the free electron gas (Drude) model of metals is introduced. In this paper, a new type of spherical crown waveguide is designed, which is the excitation mode of surface isopherons and the research method used in this paper: the finite element method (FEA), the finite element method (FEA), is used to design a new type of spherical crown mixed isoexcitator waveguide. The local characteristics and transmission intensity of the isobaric waveguide are studied. The results show that the hybrid waveguide has stronger localization and longer transmission distance. (4) A hybrid waveguide with a metal cap is designed. Conjunctive surface isophosphoric waveguide structure, The relationship between effective area, propagation length, nonlinear coefficient 緯, nonlinear quality factor F and waveguide parameters and nonlinear material is analyzed. The optimal parameters of the designed waveguide and the best nonlinear material are obtained. A kind of isolator filter with two nano-disk resonators is designed. According to the disk resonance theory and the waveguide coupling theory, the resonant wavelength is analyzed. The relationship between transmission efficiency and waveguide parameters shows that the resonant wavelength of the filter can be adjusted by the diameter of the disk, and the transmission efficiency can be adjusted by the spacing between the waveguide and the disk. In this paper, a novel structure of graphene surface isophosphor waveguide is designed, and the relationship between effective refractive index, propagation distance, cutoff wavelength and waveguide parameters is analyzed. On this basis, an adjustable optical switch structure is designed, and its transmission performance is analyzed. The results show that the designed optical switch structure can realize different switching states at different Fermi energy levels. A graphene surface isopultionic waveguide array structure is designed and its mode and propagation constant are analyzed in detail. Based on the supermode coupling theory, the theory of adding different higher-order modes in arrayed waveguides is introduced to realize the Tiber effect in graphene surface isophosphoric element array, and the graphene energy levels are analyzed in detail theoretically and numerically. The results show that the simulation results are in agreement with the theoretical calculation and verify the different higher-order mode addition theories proposed in this paper. This is of great value for the future application of graphene in the field of self-imaging.
【學(xué)位授予單位】：青島大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN25;O441.4

【參考文獻】

相關(guān)期刊論文 前1條

1 尹昊智;劉玉敏;俞重遠(yuǎn);石強;宮慧;吳秀;宋鑫;;Nonlinear hybrid plasmonic slot waveguide for second-harmonic generation[J];Chinese Optics Letters;2013年10期

相關(guān)博士學(xué)位論文 前1條

1 劉金養(yǎng);石墨烯及其復(fù)合結(jié)構(gòu)的設(shè)計、制備和性能研究[D];中國科學(xué)技術(shù)大學(xué);2013年

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本文編號：1540779