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標題: | 研究單分子與金屬奈米粒子耦合結構下之螢光增益現象 Study on Enhancement of Single Molecule Fluorescence Using Metallic Nanoparticles |
作者: | Jeng-Hong Chen 陳建宏 |
指導教授: | 郭茂坤 |
關鍵字: | 表面電漿共振,奈米光學天線,單螢光分子,螢光增益,多重中心展開法, Surface plasmon resonance,Optical nanoantenna,Single fluorescent molecule,Fluorescence enhancement,Multi-multipole method, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 根據麥克斯威爾電磁理論,探討三維金、銀奈米粒子受平面電磁波入射與電偶極波源激發後產生之電磁場。在多重中心展開法的理論架構下,以多個展開中心展開散射體之散射及內域場,透過在散射體邊界上取點及滿足邊界條件以建立一係數矩陣方程組,並以奇異值拆解法求解矩陣。
本研究探討將一單分子置於金、銀奈米粒子附近形成一耦合結構。使用平面電磁波入射此結構後產生之局部電場激發此單分子,產生能階躍遷後釋放出螢光,利用一電偶極波源模擬單分子並再與金、銀奈米粒子作用後,得到一螢光增益的效果。接著將奈米粒子變換成橢球形狀及核-殼結構,並接著利用雙顆奈米粒子結構產生極強之局部電場來激發單分子,研究其螢光增益。由數值模擬結果可看出橢球形狀及核-殼結構皆有較好之螢光增益並有助於最大螢光增益波長之紅移,並在雙顆奈米粒子結構下產生極強的螢光增益及波長紅移之現象。 Electromagnetic field of gold and silver nanoparticles under plane wave and electric dipole incident are investigated. By using Maxwell’s equation and multi-multipole method, a set of linear equations of expansion coefficients is first constructed by satisfying boundary condition pointwisely. Singular value decomposition is then used to solve the overdetermined liner equations. Study on coupling of single fluorescent molecule and metallic (solid and core-shell) nanoparticles . Under plane wave incident, the local electric field would be arose and let the molecule reaching excitation stage and liberating fluorescence. We use a electric dipole to simulate single fluorescence molecule. By working with metallic nanoparticles, the molecule would have fluorescence enhancement of single molecule. Then we use the strong electric local field from two metallic nanoparticles to excite the molecule. We demonstrate that it would generate the better enhancement. And the maximum enhancement is achieved when the emission frequency is red-shift from the surface plasmon resonance of the particles. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37678 |
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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