基于表面等離子體波導(dǎo)的諧振腔設(shè)計(jì)
Resonator Design Based On Surface Plasmon Waveguide

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摘要 在文中，我們設(shè)計(jì)了一種基于表面等離子體金屬-介質(zhì)-金屬直波導(dǎo)的高品質(zhì)因數(shù)光學(xué)微諧振腔。此諧振腔利用直波導(dǎo)中的零群速度導(dǎo)模，對振蕩光波在微腔兩個(gè)端面上的輻射損耗進(jìn)行了有效的抑制，其所得的品質(zhì)因數(shù)可以達(dá)到很高。因此結(jié)果對于等離子體微腔的發(fā)展與應(yīng)用具有積極的意義；其次對諧振腔的設(shè)計(jì)原理與方案進(jìn)行了分析討論，直波導(dǎo)中的零群速度導(dǎo)模所具有的超慢群速度可以增加光波在諧振腔中往返一次的傳播時(shí)間，同時(shí)此超慢群速度還可以減少光波每次在邊界反射時(shí)產(chǎn)生的能量損耗。由此直波導(dǎo)改造而成的諧振腔可以獲得非常高的品質(zhì)因數(shù)。接下來文章描述了諧振腔的結(jié)構(gòu)與金屬材料的模型；并對諧振腔進(jìn)行了基于時(shí)域有限差分方法的仿真實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果與理論分析之間具有良好的一致性，直波導(dǎo)的零群速度導(dǎo)模給諧振腔的品質(zhì)因數(shù)帶來了很大的提升，得出當(dāng)諧振腔的長度逐漸增大時(shí)，共振模的共振頻率將隨之逐漸收斂到零群速度頻率點(diǎn)上。

關(guān)鍵詞 表面等離子體 光學(xué)微腔 共振頻率 FDTD

Resonator Design Based On Surface Plasmon Waveguide

Abstract：As it is shown in the article，we design a micro-resonator which based on straight waveguide of surface plasmon with high quality factor .This resonator equipped with zero group velocity guide model which can reduce the radiation losses of the oscillation light in both end surface of the micro-cavities,so we can get a high quality factor.As a result it makes a great difference for the development and the apply of microcavity plasma.Futher more , the design principle and programs cavity is disscused that the group speed of stright wave guide can reduce the energy loss caused by boundary reflection.So ,to get high quality factor ，we can use the resonator improved by stright waveguide.Then the article discribed the model structure and metal cavity.Also some related simulation.The consequence of the simulation is exactly correspond to the theory.the zero group guide model promote a lot advances to the quality factor,and we also see that as the resonator get longer. The resonant frequency of the resonant mode gradually converge to zero group velocity frequency .

Keywords: Surface Plasmon ,Optical Microcavity, Resonance Frequency,FDTD
目錄

第一章 簡介 1
1.1發(fā)展歷程 1
1.2 MIM表面等離子體 2
1.3諧振腔 4
第二章 設(shè)計(jì)過程 6
2.1 超慢群速度的形成 6
2.2 MIM中波的傳輸模式 7
2.3 品質(zhì)因數(shù)的求解 7
2.4 表面等離子體的色散關(guān)系 8
2.5 微腔設(shè)計(jì) 10
第三章 數(shù)值模擬 11
3.1 軟件簡介 11
3.2結(jié)構(gòu)模擬 12
第四章 數(shù)據(jù)分析 18
4.1 遠(yuǎn)場場強(qiáng)分布 18
4.2 Q值的變化 19
結(jié)論 20
致謝 21
參考文獻(xiàn) 22
附錄： 24