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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74372
標題: | 接合至金屬奈米顆粒之光敏劑受表面電漿子共振調控吸收與發光行為的模擬研究 Simulation Study on Surface Plasmon Resonance Regulated Absorption and Emission Behaviors of Photosensitizer Linked onto a Metal Nanoparticle |
作者: | Yu-Hua Chen 陳昱樺 |
指導教授: | 楊志忠(Chih-Chung Yang) |
關鍵字: | 表面電漿子,光敏劑,金奈米棒, surface plasmon,photosensitizer,gold nanorod, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 金屬奈米顆粒的表面電漿子耦合能增強接合到顆粒表面的光敏劑吸收效率,增加活性氧的產生效率,進而提升光動力療法的療效。然而,表面電漿耦合同時也會增強光敏劑的放光效率,因能量損失而降低活性氧的產生效能。為了瞭解在表面電漿子耦合下,光敏劑吸收的最大化,與放光的最小化條件,我們建構了一套數值模型,模擬金奈米棒在表面電漿耦合效應下,接合在奈米棒表面的光敏劑AlPcS之吸收與放光行為。我們設定吸收與放光偶極子為兩個獨立的二階系統,來描述光敏劑的吸收與放光行為。模擬得到的躍遷比例(歸一化的放射功率)可以顯示,表面電漿子耦合使光敏劑吸收與放光增加的行為。我們利用數值計算研究躍遷比率與歸一化放光功率,和金奈米棒的幾何形狀、光敏劑與奈米棒表面的最短距離,以及光敏劑在不同方位角之間的相互關係,以瞭解表面電漿子耦合效應。 Although surface plasmon (SP) coupling of a metal nanoparticle (NP) can enhance the absorption of a photosensitizer linked onto the NP for increasing the generation efficiency of reactive oxygen species (ROS) and hence photodynamic therapy effectiveness, SP coupling can also enhance the emission efficiency of the photosensitizer for causing energy loss such that the ROS generation efficiency is reduced. To understand the possibility of maximizing photosensitizer absorption and minimizing its emission through SP coupling at the same time, we build numerical algorithms for simulating the SP coupling effects of an Au nanorod (NR) on the absorption and emission behaviors of a photosensitizer, AlPcS, linked onto the Au NR. We use an absorbing dipole and a radiating dipole with individual two-level systems to describe the absorption and emission behaviors of the photosensitizer. The population ratio (normalized radiated power) is evaluated to demonstrate the enhancement of photosensitizer absorption (emission) through SP coupling. The variations of population ratio and normalized radiated power with the changes of Au NR geometry, the shortest distance between photosensitizer and Au NR surface, and the polar and azimuthal positions of photosensitizer are numerically investigated for understanding the SP coupling effect. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74372 |
DOI: | 10.6342/NTU201902729 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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