In the present study, the transfer of energy between a pair of donor–acceptor molecules as point-like dipoles located nearby a plasmonic nanoparticle is investigated, in which an electric point charge is placed at a distance rq from the center of metallic nanoparticle or nanoshell. It is shown that the process of energy transfer between pairs of molecules is affected when an external point charge is placed next to the plasmonic nanoparticle. In addition to the contribution of the dipolar plasmon mode, the contribution of the quadrupolar and octupolar modes is taken into account because these plasmonic modes are more sensitive to changes; therefore, they can be used in sensing applications. The effect of the physical parameters of the system, such as the magnitude of the electric charge, the distance of the electric charge, the dielectric constant of the host medium, the distance of the donor molecule, and type of metal nanoparticle on the intermolecular energy transfer, is studied. However, we calculate and demonstrate that it is possible to use an electric point charge next to a hybrid plasmonic nanoparticle-molecular system to enhance the energy transfer from a donor molecule to an acceptor molecule.

中文翻译：

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分子-等离子体系统中分子间能量转移的研究：电荷的影响

在本研究中，研究了作为位于等离子体纳米粒子附近的点状偶极子的一对供体 - 受体分子之间的能量转移，其中点电荷位于距金属纳米粒子或纳米壳中心的距离为 rq 处. 结果表明，当外部点电荷靠近等离子体纳米粒子时，分子对之间的能量转移过程会受到影响。除了偶极等离子体模式的贡献外，还考虑了四极和八极模式的贡献，因为这些等离子体模式对变化更敏感；因此，它们可用于传感应用。系统物理参数的影响，如电荷的大小、电荷的距离、研究了主体介质的介电常数、供体分子的距离和金属纳米粒子类型对分子间能量转移的影响。然而，我们计算并证明可以在混合等离子体纳米粒子-分子系统旁边使用点电荷来增强从供体分子到受体分子的能量转移。