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We demonstrate engineering of the spectral content and polarization ofphotoluminescence (PL) from arrayed gold nanoparticles atop asubwavelength-thin dielectric spacer and optically-thick gold film, aconfiguration that supports gap-surface plasmon resonances (GSPRs). Choice ofshapes and dimensions of gold nanoparticles influences the GSPR wavelength andpolarization characteristics, thereby allowing us to enhance and spectrallymold the plasmon-assisted PL while simultaneously controlling its polarization.In order to understand the underlying physics behind the plasmon-enhanced PL,we develop a simple model that faithfully reproduces all features observed inour experiments showing also good quantitative agreement for the PL enhancement

Gold Photoluminescence Wavelength and Polarization Engineering