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金属纳米粒子的表面等离激元增强效应是纳米科学领域的一个研究热点.针对染料分子与金属纳米粒子的耦合系统,应用偶极-偶极近似计算分子与金属纳米粒子的库仑相互作用,并应用密度矩阵理论描述在不同极化方向的电场作用下的电荷输运过程,分析了分子与金属纳米粒子在不同相对位置下分子激发态的动力学过程,发现表面等离激元的增强效应与分子和金属钠米粒子的相对位置以及等离激元的耗散系数有密切关系,详细讨论了分子与金属纳米粒子间的耦合强度、外场的极化方向、等离激元的寿命及共振激发条件对分子激发态及表面等离激元增强的影响,分析了分子-金属纳米粒子耦合系统中表面等离激元增强效应的物理本质.
Surface Plasmon Enhancement of Metal Nanoparticles is a hot topic in the field of nanoscience.For the coupling system of dye molecules and metal nanoparticles, Coulomb interaction between metal nanoparticles and molecules is calculated by dipole-dipole approximation Density matrix theory was used to describe the charge transport process under the action of an electric field with different polarization directions. The kinetics of the molecular excited states of the molecules and metal nanoparticles at different relative positions were analyzed. The enhancement effect of surface plasmon and The relative position between molecules and metallic sodium nanoparticles and the dissociation coefficient of plasmonic are closely related. The coupling strength between molecular and metallic nanoparticles, the polarization direction of external field, the lifetime of plasmon and the resonance excitation Conditions on the molecular excited state and surface plasmon enhancement, analysis of the molecular-metal nanoparticle coupling system surface plasmon enhancement effect of the physical nature.