Abstract
Dye molecules placed on metallic gratings can experience an enhanced electromagnetic field if illuminated under surface plasmon excitation conditions, a situation that can be employed for sensor applications. The fluorescence emission in this situation exhibits a characteristic emission polarization and geometry given by the fluorophore/grating interaction. We present experiments visualizing the full shape of the emission profiles and demonstrate how they can be manipulated by means of the grating constant. The excitation and emission processes taking place on the grating surface are characterized by polarization sensitive measurements.
Highlights
Surface plasmon resonance (SPR) spectroscopy [1] has matured into a versatile method for the quantitative characterization of thin films and interfaces [2]
The PD was exchanged against the photomultiplier tube (PMT) to scan the emission angle relative to the grating normal
The same mechanisms can take place with time being reversed: an excited fluorophore can transfer its energy into a metal film to launch a red-shifted surface plasmon, which decays via emission of a far field photon at the fluorescence wavelength
Summary
Surface plasmon resonance (SPR) spectroscopy [1] has matured into a versatile method for the quantitative characterization of thin films and interfaces [2]. The alternative technique, introduced by Kretschmann [10], turned out to be a lot more versatile for widespread applications. The latter method uses a thin film, typically of a noble metal (Au or Ag) evaporated onto the coupling prism, with the surface plasmon mode being excited through the prism at the opposite metal/dielectric interface. Both approaches operate with photons in the total
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