Plasmon effect in the donor-acceptor pairs of dyes with various efficiency of FRET

Plasmon-activated Forster energy transfer in molecular systems

“…The proposed model takes into account only one of the spherical plasmonic NPs of an island metal film, which is closest to the selected molecular pair DA. The SEM images obtained in the article [27] indicate a rather isolated nature of individual NPs (islands). Therefore, in contrast to the models of articles [28][29][30], in which a continuous homogeneous metal layer was considered, in this case it is appropriate to identify only nearby particles into a separate cluster: a plasmon globule with radius R and one donoracceptor molecular pair separated from it by several layers of stearic acid with thickness h (Fig.…”

“…In this article, we use the theoretical model previously proposed in [23], which describes the effect of localized plasmon resonance of spherical metal NPs on the development of FRET, and test its modified version using a regularized molecular nanostructure as an example. For this, we used the experimental data published in the article [27], where the plasmon-enhanced Förster resonant energy transfer in donor-acceptor pairs with different energy transfer efficiencies was experimentally studied. Layered dye films interspersed with screening layers of stearic acid molecules using the Langmuir−Blodgett technology (LB technology) with an island distribution of silver NPs on the substrate surface were prepared for the study in [27].…”

“…For this, we used the experimental data published in the article [27], where the plasmon-enhanced Förster resonant energy transfer in donor-acceptor pairs with different energy transfer efficiencies was experimentally studied. Layered dye films interspersed with screening layers of stearic acid molecules using the Langmuir−Blodgett technology (LB technology) with an island distribution of silver NPs on the substrate surface were prepared for the study in [27]. The size of Ag NPs in films was 80−100 nm.…”

Distance-Dependent Fluorescence Resonance Energy Transfer Enhancement on Nanoporous Gold

“…The fluorescence intensity of YFP reached the maximal value with the spacing layer of 10.5 nm, meanwhile the fluorescence intensity of CFP-2 with the wavelength closer to the YFP absorption peak is almost completely quenched (Figure 4b). Therefore, it can be assumed that this longwave emission should be attributed to the sensitized fluorescence of the acceptor molecules, resulting from the energy transfer from the singlet-excited energy donor molecules to the acceptor molecules in the ground state [27].…”

“…Plasmonic enhancement which resulting from longer range non-radiative energy transfer via nanometal surface energy transfer or localized surface plasmon-coupled FRET effect is a promised method to further improve the fluorescence intensity of the acceptor, extending the application of FRET [10][11][12][13][14][15][16][17]. The FRET between different fluorophores can be modulated by adjacent plasmonic nanocrystals [18][19][20][21][22][23], and the efficiency of FRET and acceptor fluorescence intensity from FRET varies with the size, shape, and location of the metal nanostructure [24][25][26][27]. A two-fold improvement of energy transfer between donor and acceptor has been realized with silver film due to the strong confinement and large propagation length of surface plasmon polaritons [20].…”