Polarization control of metal-enhanced fluorescence in hybrid assemblies of photosynthetic complexes and gold nanorods
Sprache des Titels:
Englisch
Original Kurzfassung:
Fluorescence imaging of hybrid nanostructures composed of a bacterial light-harvesting complex LH2
and Au nanorods with controlled coupling strength is employed to study the spectral dependence of
the plasmon-induced fluorescence enhancement. Perfect matching of the plasmon resonances in the
nanorods with the absorption bands of the LH2 complexes facilitates a direct comparison of the
enhancement factors for longitudinal and transverse plasmon frequencies of the nanorods. We find that
the fluorescence enhancement due to excitation of longitudinal resonance can be up to five-fold
stronger than for the transverse one. We attribute this result, which is important for designing plasmonic
functional systems, to a very different distribution of the enhancement of the electric field due to the
excitation of the two characteristic plasmon modes in nanorods.