Abstract
Surface plasmon (SP) coupling has been successfully applied to nonradiative energy transfer via exciton-plasmon-exciton coupling in conventionally sandwiched donor-metal film-acceptor configurations. However, these structures lack the desired efficiency and suffer poor photoemission due to the high energy loss. Here, we show that the cascaded exciton-plasmon-plasmon-exciton coupling in stratified architecture enables an efficient energy transfer mechanism. The overlaps of the surface plasmon modes at the metal-dielectric and dielectric-metal interfaces allow for strong cross-coupling in comparison with the single metal film configuration. The proposed architecture has been demonstrated through the analytical modeling and numerical simulation of an oscillating dipole near the stratified nanostructure of metal-dielectric-metal-acceptor. Consistent with theoretical and numerical results, experimental measurements confirm at least 50% plasmon resonance energy transfer enhancement in the donor-metal-dielectric-metal-acceptor compared to the donor-metal-acceptor structure. Cascaded plasmon-plasmon coupling enables record high efficiency for exciton transfer through metallic structures.
Highlights
In this study, we propose and demonstrate the nonradiative energy transfer mechanism between the donor and the acceptor multilayers through layered metallic nanostructures, in which the stratified configuration gives rise to an efficient energy transfer process
As a matter of fact, the evanescent electric fields coupling of the donor/ acceptor excitons to the surface plasmon modes of the metal films plays a crucial role in energy migration[3,18,19,20]
It was well demonstrated in literature that the key factor in designing the structures benefiting an efficient SP-nonradiative energy transfer (NRET), is to distinguish the difference between the direct quenching/enhancing effect of a plasmonic nanostructure on the donor/acceptor emission and the improved efficiency due to SP-NRET5,9,21,22
Summary
We propose and demonstrate the nonradiative energy transfer mechanism between the donor and the acceptor multilayers through layered metallic nanostructures, in which the stratified configuration gives rise to an efficient energy transfer process. This novel approach in NRET, uniquely provides us with the ability to overcome the drawback of high energy absorption losses in a thick metal film by inserting a non-absorbing dielectric layer between two thin metal films. The proposed architecture leads to a remarkable energy transfer efficiency as a result of stronger surface plasmon coupling at the metal-dielectric boundaries
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