本文選題：光學(xué)暗態(tài)　切入點：等離子誘導(dǎo)透明　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：金屬—介質(zhì)—金屬(Metal-Dielectric-Metal,MDM)表面等離激元(Surface Plasmon Polaritons,SPPs)波導(dǎo)結(jié)構(gòu)中光的傳播及耦合特性已經(jīng)得到了廣泛研究,因其能夠有效突破光學(xué)衍射極限的束縛,能將光場束縛在納米尺度并進行靈活可控地傳輸調(diào)控,因而廣泛應(yīng)用于微鈉光學(xué)領(lǐng)域。正因為表面等離激元對光在納米尺度或深亞波長尺度上的束縛和操控能力,我們可以利用基于SPP的等離子波導(dǎo)系統(tǒng)中模擬實現(xiàn)很多原子系統(tǒng)中的特殊光調(diào)控效應(yīng),比較重要的是電磁誘導(dǎo)透明(Electromagnetically Induced Transparency,EIT)和Fano共振等。本文針對以上特點,結(jié)合理論分析及數(shù)值電磁仿真,從光學(xué)明態(tài)和暗態(tài)及其相互作用的角度研究光在表面等離子波導(dǎo)系統(tǒng)中的傳輸特性及其調(diào)控機理和手段。首先,針對MDM波導(dǎo)中傳輸SPP波的相關(guān)特點以及諧振腔模式耦合特性,系統(tǒng)地分析了光學(xué)明態(tài),尤其是光學(xué)暗態(tài)以及它們之間的相互作用在MDM波導(dǎo)系統(tǒng)中對透射譜的調(diào)控。結(jié)果表明光學(xué)暗態(tài)在不同作用方式下能夠顯著地調(diào)節(jié)透射譜線形,形成類似于EIT的等離子誘導(dǎo)透明(Plasmon Induced Transparency,PIT)現(xiàn)象。針對多模耦合共振系統(tǒng),我們使用時域耦合模理論(Temporal Coupled Mode Theory,TCMT)分析了正交和非正交模式對MDM波導(dǎo)透射譜的調(diào)制情況。理論和數(shù)值結(jié)果表明存在正交模式的共振系統(tǒng)的透射譜迥異于非正交模式的情形。當兩個正交模式的頻率差減小到特定閾值以下,就會形成全透特性,因此可以說這兩個模式對于波導(dǎo)系統(tǒng)來說都是不可見的�；谟邢拊椒ǖ娜〝�(shù)值模擬結(jié)果能夠有效地與理論分析吻合。此外,針對多模(多腔)耦合共振系統(tǒng)的周期性MDM波導(dǎo)結(jié)構(gòu),提出結(jié)合時域耦合模理論和傳輸矩陣方法,研究了由多重Bragg反射引起的Bragg帶隙和局域共振態(tài)形成的“極化子”(Polariton)帶隙,以及兩者相互作用對波導(dǎo)透射譜的調(diào)制特性。結(jié)果表明不同的周期長度引起的Bragg帶隙和在空間上通過級聯(lián)共振腔相互耦合形成的雜化模式“極化子”帶隙一旦發(fā)生部分或者全部重疊,那么在重疊譜區(qū)域就會形成一個微通帶(mini-band),在這里表面等離子體波發(fā)生明顯的相干隧穿效應(yīng),表現(xiàn)為透射譜中形成了明顯的多PIT現(xiàn)象。本文研究結(jié)果對于設(shè)計新型亞波長相干波導(dǎo)器件具有一定指導(dǎo)意義,可用于構(gòu)建基于MDM結(jié)構(gòu)的濾波器、路由器、以及加減器等。
[Abstract]:The propagation and coupling characteristics of light in the surface of metal-dielectric metallic-metallic-metallics (MDM) surface surface Plasmon Polaritons (SPPsS) waveguide have been extensively studied because it can effectively break through the confinement of optical diffraction limit.It is widely used in the field of microsodium optics due to its ability to bind the light field to nanometer scale and to control the transmission flexibly.Because of the ability of surface isopherons to bind and manipulate light on nanometer scale or deep subwavelength scale, we can simulate and realize the special optical modulation effect in many atomic systems by using SPP based plasma waveguide system.The most important ones are electromagnetically Induced transparent and Fano resonance.In view of the above characteristics, combined with theoretical analysis and numerical electromagnetic simulation, this paper studies the transmission characteristics of light in the surface plasma waveguide system from the point of view of optical light state and dark state and their interaction, as well as the control mechanism and means.Firstly, aiming at the characteristics of transmitting SPP waves in MDM waveguides and the coupling characteristics of resonator modes, the optical light states, especially the optical dark states and their interactions in the MDM waveguide system, are systematically analyzed.The results show that the optical dark state can significantly adjust the transmission line shape in different modes of action and form plasmon Induced transparent bit phenomenon similar to that of EIT.For multimode coupled resonance systems, the time domain coupled mode theory (Temporal Coupled Mode Theoryn) is used to analyze the modulation of transmission spectra of MDM waveguides by orthogonal and non-orthogonal modes.The theoretical and numerical results show that the transmission spectra of resonance systems with orthogonal modes are different from those of non-orthogonal modes.When the frequency difference between the two orthogonal modes is reduced to below a specific threshold, the fully permeable characteristics will be formed, so it can be said that the two modes are invisible to the waveguide system.The results of full wave numerical simulation based on finite element method are in good agreement with theoretical analysis.In addition, for the periodic MDM waveguide structure of multi-mode (multi-cavity) coupled resonance system, a time-domain coupled mode theory and a transmission matrix method are proposed.The Bragg band gap caused by multiple Bragg reflection and the polaron band gap formed by the local resonance state are studied, and the modulation characteristics of the waveguide transmission spectrum by the interaction of the two kinds of band gaps are studied.The results show that the band gap of Bragg caused by different period length and the hybrid mode "polaron" band gap formed by coupling each other through cascaded resonators in space are partially or completely overlapped.Then a micro-passband mini-band is formed in the overlapping spectrum region where the coherent tunneling effect of the surface plasma wave is obvious and the phenomenon of multiple PIT is formed in the transmission spectrum.The results of this paper are useful for the design of new subwavelength coherent waveguide devices, and can be used to construct filters, routers, adders and subducers based on MDM structure.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN25

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本文編號：1711749