Nonradiative energy transfer (NRET) has been applied in various applications of Nanosensors, Raman scattering, color
tuning, light harvesting and organic light emitting structures. Due to the small range of donor-acceptor separation
distance that NRET is effective, the improvement in energy transfer (ET) efficiency for thicker structures seems
necessary. The plasmons resonance energy transfer (PRET) has been successfully employed to improve the NRET
efficiency. The conventional plasmonic configuration consists of donor-metal nanostructure-acceptor shows remarkable
improvement of PRET efficiency from the excited donor dipole to the acceptor molecule in longer separation distance.
We report the first successful cascaded plasmons coupling in planar structure of donor/acceptor thin film that
significantly gives rise to enhancement of ET efficiency. Moreover, the theoretical analysis shows an enhancement in
induced electric field due to stratified metal-dielectric configuration compared to simple metal thin film. We observed
ET efficiency increases more than 100% by applying dielectric layer between two metal films in plasmonic structure.
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