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Natalia Strekal Olga Kulakovich Valiantsin Askirka Iosif Sveklo Sergey Maskevich 《Plasmonics (Norwell, Mass.)》2009,4(1):1-7
Plasmonic gold films (PGF) prepared by vacuum deposition of gold onto quartz slides possess unique property to enhance electromagnetic
signal in the near field. Spectral tuning of PGF’s plasmon band to resonance with the electronic spectra of adsorbed molecules
provides selective enhancement of fluorescence or surface-enhanced Raman scattering in the far field. Plasmon-enhanced fluorescence
(PEF) of mitoxantrone (mitox) as a function of the distance between gold surface and adsorbed molecules for different polarization
and incidence angle of exciting light is analyzed in this work. Spectrophotometric data reveal that probability of localized
plasmon excitation in gold grains increases with growth of incidence angle for s-polarized and decrease for p-polarized excitation. This fact correlates well with oblate shape of gold particles detected by Atomic force microscope.
However, the fluorescence intensity of dyes deposited at fixed distance from gold surface increase with angle of incidence
of p-polarized light more noticeably than for s-polarized one. Nevertheless, the behavior of mitox PEF signal upon p-polarized laser excitation and different angle of incidence are similar in appearance to such phenomenon as selective photoelectric
effect. According to this observation, the near-field interactions between plasmons and molecule as possible mechanism of
PEF is discussed. 相似文献
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