Abstract
We study the interplay between optical properties and photoluminescence spectra of structures based on square lattices of silver nanodiscs or nanoholes in silver embedded in or adjoined to a dye-doped polymer waveguiding layer. The lattices and the waveguiding gain layer were designed to overlap the spectral features of such two-dimensional (2D) plasmonic structures. By varying the lattice constant, we demonstrate a condition for a significant increase of photoluminescence intensity and compare lifetime reduction for both nanodiscs- and nanoholes-based structures, when pumping them below lasing threshold. These enhancements are reached by matching the dark modes of the structure with the gain medium fluorescence spectrum.
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