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標題: | 金屬奈米核殼粒子對螢光增益之研究 Enhancement Factors of Metallic Nano-coreshells on Fluorescence |
作者: | Wei-Min Tu 杜偉民 |
指導教授: | 郭茂坤(Mao-Kuen Kuo) |
關鍵字: | Mie理論,並矢格林函數,激發效率,量子效率,螢光增益, Mie theory, dyadic Green’s function,quantum yield,excitation rate,enhancement factor, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 根據Maxwell電磁理論、Mie理論、並矢格林函數,整理三維金屬奈米粒子受到平面波與電偶極波源入射後其散射電磁場之解析解。最後更進一步定義激發效率、量子效率、螢光增益與平均螢光增益,探討其近、遠場性質。
本研究首先整理平面波入射實心散射體問題,並經由Mie理論求得散射係數與散射電磁場級數解,並進一步將實心散射體延伸推廣至核-殼散射體。而電偶極波源入射實心散射體問題,則是經由並矢格林函數求得散射係數與散射電磁場,並且同樣將實心散射體延伸推廣至核-殼散射體。實驗上以電偶極波源模擬螢光分子,而金屬奈米粒子靠近螢光分子的激發過程與放射過程,可利用上述兩部分解析解模擬。但實驗過程中並無法確定螢光分子的位置與方向,故最後將透過向量疊加的特性得到平均螢光增益。 Excitation stage and emission stage models for the fluorescence are used for analysis. For the excitation stage, the scatterer and the nearby molecule is irradiated by an incident plane wave. Due to the surface plasmon resonance (SPR), the Mie theory is presented for the simulation for the local electric field amplifying to pump the electrons of the molecule. After the molecule is excited, it is modeled as an electric dipole to radiate fluorescence in the emission stage. Using the method of dyadic Green’s functions, an analytic solution in series form is obtained to calculate the radiative and nonradiative decay rates of the dipole in the presence of the scatterer. According to the above results, we can even get the average enhancement facor through the principl of superposition. By this way we can explain the behavior and differences between the theory and experiment. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/43690 |
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顯示於系所單位: | 應用力學研究所 |
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