  We report the results of theoretical and experimental studies of
photoluminescence of silicon nanocrystals in the proximity of plasmonic modes
of different types. In our samples, the type of plasmonic mode is determined by
the filling ratio of a one-dimensional gold grating which covers the thin film
with silicon nanocrystals on a quartz substrate. We analyze the extinction and
photoluminesce spectra of silicon nanocrystals and show that the emitted light
is coupled to the corresponding plasmonic mode. We also demonstrate the
modification of the extinction and photoluminesce spectra under the transition
from surface plasmon-polaritons to waveguide plasmon-polaritons with the
decrease of the gold filling ratio from 1 to 0.35. Finally, we analyze the
contribution of individual silicon nanocrystals to the overall
photoluminescence intensity. We conclude that silicon nanocrystals ensemble can
be broken down into optically bright and optically dark nanocrystals. The
experimental extinction and photoluminescence spectra are in good agreement
with theoretical calculations performed by the Fourier modal method in the
scattering matrix form.
