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標題: | 以理論模擬探討材料之表面電漿對傳遞光激發能量的影響 Exploring the plasmonic effect on the excitation energy transfer by numerical simulation |
作者: | 翁詩涵 Shih-Han Weng |
指導教授: | 許良彥 Liang-Yan Hsu |
關鍵字: | 光激發能量傳遞,電漿子材料,銀奈米棒,激子擴散係數,激發能量傳遞效率, Excitation energy transfer,Plasmonic materials,Silver nanorod,Exciton diffusion coefficient,Excitation energy transfer efficiency, |
出版年 : | 2024 |
學位: | 碩士 |
摘要: | 在能源和光學的相關應用中,深入探究分子系統中的激發能量轉移機制並學習如何巧妙操控,是一個重要而引人關注的議題。
最近的研究工作致力於探索與電漿子耦合之激發能量轉移,因為電漿子材料會放大界面附近的散射場。 藉由這些特性,我們利用速率定律式的方法結合宏觀量子電動力學所得的激發能量傳遞速率以及能量耗散速率,研究了電漿子耦合激子輸運的機制。 由於銀材料介電響應的色散性質,我們發現銀奈米棒會導致激發能量的傳輸會對分子激發頻率有高依賴性。 另外,與真空中的相同系統相比,透過將共振能量轉移過程與奈米棒的局域表面電漿子耦合,可以實現大幅提高的激子擴散係數(高達1000倍)。 我們的分析還指出,若是在計算過程中採用最近鄰耦合近似,所得到的激子擴散係數比原始結果小約10倍,強調了遠距離耦合的能量傳遞途徑在與受電漿子影響的激子輸運中的重要性。 除了探索動力學體系之外,我們透過量子動力學體系研究了電漿子提高激發能量轉移效率的潛力。 這項研究不僅為探索研究電漿子耦合激子輸送的方法鋪路,而且為創新電漿子輔助光伏應用的設計提供了重要的見解。 Excitation energy transfer in molecular systems and how to manipulate such mechanism in a complex environment are essential to many energy and optical-related applications. Recent research efforts have been dedicated to the exploration of plasmon-coupled excitation energy transfer. Plasmonic materials would amplify the scattering field in the vicinity of the interface. By using these properties, the mechanism of plasmon-coupled exciton transport is investigated by using the Pauli master equation approach, combined with kinetic rates derived from macroscopic quantum electrodynamics. Through our theoretical framework, we demonstrate that the presence of a silver nanorod induces significant frequency dependence in the ability to transport exciton through a molecule chain, indicated by the exciton diffusion coefficient, due to the dispersive nature of the silver dielectric response. Compared with the same system in vacuum, great enhancement (up to a factor of 1000) in the diffusion coefficient can be achieved by coupling the resonance energy transfer process to localized surface plasmon polariton modes of the nanorod. Furthermore, our analysis reveals that the diffusion coefficients with the nearest-neighbor coupling approximation are around 10 times smaller than the results obtained beyond this approximation, emphasizing the significance of long-range coupling in exciton transport influenced by plasmonic nanostructures. In addition to exploring the kinetic regime, we investigate the potential enhancement in excitation energy transfer efficiency through plasmon-induced effects in the quantum dynamic regime. This study not only paves the way for exploring practical approaches to studying plasmon-coupled exciton transport but also provides crucial insights for the design of innovative plasmon-assisted photovoltaic applications. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/92043 |
DOI: | 10.6342/NTU202400177 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 化學系 |
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