  Exploiting the dynamics of Plasmonic Parametric Resonance (PPR), we introduce
the theory of Plasmonic Parametric Absorbers (PPA). The key insight informing
the PPA idea is that in the PPR process a pump field experiences an extinction
rate that strongly depends on the intensity of the pump itself, creating two
distinct regimes: one of weak absorption under low intensity illumination, and
one of strong absorption when the threshold of parametric resonance is met or
exceeded. Due to this reverse saturable absorption behavior, PPAs are promising
candidates for optical limiting applications.

Optics