Possibilities of improving the characteristics of the scanning near-field optical microscope due to the plasmon-resonance increase of the nonradiative energy transfer rate

Abstract

The problem of increasing the quality of the image created by a scanning near field optical micro scope with the Förster Resonance Energy Transfer (FRET) module is discussed. The possibility of improving the resolution of the near field optical microscope due to the FRET effect is analyzed, as is the formation of high quality images of nanoobjects on the basis of signals of increased intensity obtained by means of plas mon resonance in specially formed metal nanostructures (the plasmon resonance antennas). Research results for the nonradiative transfer of the electron exitation energy between the molecules placed near the planar surface of a conductor or a metal nanocylinder of the nanometer radius, as well as around a spherical nano particle, are presented. In the simplest model, the influence of the conducting phase boundary is taken into account by introducing an effective dipole image. If the antenna is a sphertical nanoparticle, then multipole polarization formalism is a more adequate representation of the responce.

Surface Plasmon-Coupled Emission of Rhodamine 110 Aggregates in a Silica Nanolayer

“…This effect indicates the enhancement of directional aggregate emission. Recently also the effect of enhancement of energy transfer efficiency from donors to acceptors in the presence of surface plasmons (SPMEET) has been reported. , Therefore, the presented effect seems also to follow from the increase of excitation energy transfer from monomers to aggregates as the directional emission of monomers is almost totally quenched, but as seen from Figure a (upper right corner) and Figure b F-SE of monomers remains still strong even at the highest concentration of R110. Also no significant differences in the surface plasmon resonance (SPR) intensity at 530 and 570 nm were observed (SPR spectra in Figure , left panel), which additionally confirms that the changes in SPCE spectra (strong monomer emission quenching at λ = 530 nm in Figure , right panel) do not follow only from the plasmonic emission enhancement, but also from the increase of energy transfer efficiency from monomers to aggregates.…”

“…Recently also the effect of enhancement of energy transfer efficiency from donors to acceptors in the presence of surface plasmons (SPMEET) has been reported. 7,18 Therefore, the presented effect seems also to follow from the increase of excitation energy transfer from monomers to aggregates as the directional emission of monomers is almost totally quenched, but as seen from Figure 4a (upper right corner) and Figure 4b F-SE of monomers remains still strong The F-SE spectrum of R110 in SiO 2 for C R110 = 0.01 M as well as its components (monomer, dimer, and higher order aggregate).…”