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Plasmon-Controlled Förster Resonance Energy Transfer

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journal contribution
posted on 21.02.2016, 14:46 by Lei Zhao, Tian Ming, Lei Shao, Huanjun Chen, Jianfang Wang
The localized plasmons of metal nanocrystals have been widely utilized to control a variety of optical signals, such as Raman, fluorescence, and circular dichroism, from proximal dye molecules. We show, on the single-particle level, that the Förster resonance energy transfer between two different fluorophores can be modulated by adjacent plasmonic nanocrystals. The donor and acceptor fluorophore molecules are embedded in a mesostructured silica shell that is uniformly coated on Au–Ag core–shell nanocrystals. The longitudinal plasmon wavelengths of the core–shell metal nanocrystals are synthetically tailored by varying the aspect ratio. Comparison of the scattering and fluorescence spectra taken from the different hybrid nanostructures indicates that the energy transfer efficiency can be controlled by the plasmon wavelength. When the plasmon peak overlaps with the emission peak of the donor, the energy transfer channel is turned off. When the plasmon peak is red-shifted to be in between the emission peak of the donor and the absorption peak of the acceptor or right at the intrinsic emission peak of the acceptor, the energy transfer channel is turned on.