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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Systematic Computational Study of the Effect of Silver Nanoparticle Dimers on the Coupled Emission from Nearby Fluorophores
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Systematic Computational Study of the Effect of Silver Nanoparticle Dimers on the Coupled Emission from Nearby Fluorophores

机译：纳米银二聚体对附近荧光团耦合发射的影响的系统计算研究

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摘要

We use the finite-difference time-domain method to predict how fluorescence is modified if the fiuorophore is located between two silver nanoparticles of a dimer system. The fiuorophore is modeled as a radiating point dipole with orientation defined by its polarization. When a fiuorophore is oriented perpendicular to the metal surface, there is a large increase in total power radiated through a closed surface containing the dimer system, in comparison to the isolated fiuorophore and the case of a fiuorophore near a single nanoparticle. The increase in radiated power indicates increases in the relative radiative decay rates of the emission near the nanoparticles. The angle-resolved far-field distributions of the emission in a single plane are also computed. This is informative as many experimental conditions involve collection optics and detectors that collect the emission along a single plane. For fluorophores oriented perpendicular to the metal surfaces, the dimer systems lead to significant enhancements in the fluorescence emission intensity in the plane. In contrast, significant emission quenching occurs if the fluorophores are oriented parallel to the metal surfaces. We also examine the effect of the fiuorophore on the near-field around the nanoparticles and correlate our results with surface plasmon excitations.
机译：如果荧光团位于二聚体系统的两个银纳米颗粒之间，我们使用有限差分时域方法来预测荧光如何被修饰。荧光体被建模为辐射点偶极子，其定向由其极化定义。与孤立的荧光团和单个纳米粒子附近的荧光团相比，当荧光团垂直于金属表面定向时，通过包含二聚体系统的封闭表面辐射的总功率将大大增加。辐射功率的增加表明纳米粒子附近发射的相对辐射衰减率增加。还计算了单个平面中发射的角度分辨远场分布。这是有益的，因为许多实验条件都涉及收集光学器件和检测器，它们沿单个平面收集发射。对于垂直于金属表面定向的荧光团，二聚体系统导致平面中荧光发射强度的显着增强。相反，如果荧光团平行于金属表面取向，则会发生明显的发射猝灭。我们还检查了荧光团对纳米粒子周围近场的影响，并将我们的结果与表面等离子体激元激发相关联。

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