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標題: | 銀奈米粒子與銀島之近場耦合對金屬增強螢光效益之影響 Near-field coupling of silver nanoparticle and silver island on metal-enhanced fluorescence |
作者: | Hsin-Yu Wu 巫信佑 |
指導教授: | 郭茂坤 |
共同指導教授: | 廖駿偉 |
關鍵字: | 金屬螢光增益,銀島,銀球,多重中心展開法,表面電漿子共振,激發率,量子效率,增強因子,光力, metal enhancement fluorescence(MEF),silver island,silver nanoparticle,multiple multipole (MMP) method,surface plasmon resonance (SPR),gap,excitation rate,quantum yield,enhancement factor,optical force, |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | 本文研究銀島與銀球相互作用的金屬螢光增益,銀島與銀球結構的表面電漿子耦合使間隙區域的|E|提升。我們使用多重中心展開法(MMP)來分析位於間隙區域之螢光分子的螢光增益,其中銀島為為一扁橢球。本研究選擇螢光分子TRITC 和Texas red來做計算,定量分析具有不同的間隙、平面波的入射角度、銀島與銀球尺寸形狀的金屬螢光效應。
數值分析結果指出,混和奈米結構的間隙耦合使得金屬螢光增益的增強因子較單一銀島佳,間隙愈小增強因子愈強,並且發現與先前實驗結果一致,除此之外,發現縮短銀島與銀球的間隙可以提高金屬螢光增益;表面電漿子共振波長能帶會隨著銀島變扁或尺寸變大而紅位移或能帶變寬,此性質使我們可以為了特定的螢光分子選定銀島的尺寸,以便得到最大的激發率;最後,發現銀球會受到誘導光力而靠近銀島,使銀島與銀球之間隙減小而增強金屬螢光增益效應。 The metal enhanced fluorescence (MEF) of a silver island (SI) associated with a silver nanoparticle (SNP) was studied in this thesis. The coupling plasmonic effect of the hybrid nanostructure can enhance the near field within the gap zone. We use the multiple multipole method to analyze the plasmon-mediated enhancement factor on the fluorescence of a molecule located in the gap zone, where the SI is modelled as an oblate spheroid. The fluorescent molecules used for simulation in this study are TRITC and Texas red. We quantitatively analyzed the MEF effects with different gaps, the incident angles of plane wave, and the sizes and shapes of SI and SNP. Numerical results show that the enhancement factor of the hybrid nanostructure on MEF is higher than that of a SI alone due to the coupled gap mode; the smaller the gap the larger the enhancement factor. This finding is in agreement with the previous experimental results. In addition, reducing the distance between molecule and SNP can also raise MEF. The surface plasmon resonance (SPR) band of the SI is red-shifted and broadened by being flattened or enlarged. This property allows us to tailor the shape of SI for obtaining the maximum excitation rate on a specific molecule. Moreover, we found that the induced optical force allows SNP be attracted by SI to reduce the gap gradually for performing a stronger MEF effect |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52893 |
全文授權: | 有償授權 |
顯示於系所單位: | 應用力學研究所 |
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