  A spatial-frequency thin-film filter with inclusions of nanoparticles
operating in the visible range of the spectrum is investigated. The effect of
nanoparticles embedded in the central and lateral layers of the frustrated
total internal reflection filter on the spectral characteristics, taking into
account the frequency dispersion, is investigated. It is shown that plasmonic
effects cause splitting of the filter bandwidth into a set of narrow-band
spectral lines and angular splitting of the incident beam into a set of output
beams.
