Dynamic control of collective modes of localized surface plasmon in metallic nanoparticles by optical tweezers

Optical properties of a localized surface plasmon (LSP) in metallic nanoparticles (MNPs) are widely used for applications in the biosensor, the medical therapy, the plasmonic optical devices and so on. If we can dynamically control a collective behavior of LSP by assembling lots of MNPs under thermal fluctuations, we would realize a variety of applications based on the tunable strong light scattering and absorption at room temperature. There are many reports on the stable optical trapping of MNPs using the direct light-induced force (LIF) by focused laser beam, whereas there are almost no discussions on the optical response of MNPs under the self-consistent inter-object LIF and the fluctuation induced random force. However, these forces would provide effective way to assemble MNPs. Therefore, I theoretically explore the possibility of dynamic control of LSP in MNPs by self-consistent LIF in the presence of thermal fluctuations.