Optics Communications 353, 49-55 (2015)

ISSN: 0030-4018, SCI

The local field dependent effect of the critical distance of energy transfer between nanoparticles

Chu Viet Ha, Do Thi Nga, Nguyen Ai Viet, Tran Hong Nhung

The fluorescence resonance energy transfer between various types offluorophore pairs was investigated. Dye molecules, quantum dots,fluorescent nanoparticles (dye molecules encapsulated in polymer ma-trices) were used as donor D. Dye molecules and gold nanoparticles were used as acceptor A. We found that the experimental Förster critical transfer distance R0 is 1–10 nm when both D and A are dye mo-lecules, and becomes larger than 10 nm when the donor is fluorescent nanoparticles. When the acceptors A are gold nanoparticles, the case is considered as localized plasmon coupled nanosurface energy transfer (NSET), the experimental critical distance d0increases up to few ten nanometers when D are dye molecules or quantum dots. For thefirst time, un-expected giant resonance energy transfer (G-RET) phenomenon is observed in our experiments with very large critical transfer distance d0, which increases from few ten nanometers to micrometers when the donors are fluorescent and the acceptors are gold nanoparticles. A model “nanowave emitter station and antenna” is given to explain the local field dependence of the critical distance of energy transfer between those nanoparticles. Moreover, a simple theoretical model with size–number contribution (forfluorescent nanoparticles) and surface plasmon coupled enhancement effect (for gold nanoparticles) is proposed to explain these obtained experimental results.

DOI: 10.1016/j.optcom.2015.05.015

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