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To study the dynamical optical interactions of nano-scaledmetal-insulator-metal (MIM) structures in temporal-frequency domain,femtosecond surface plasmon polariton (SPP) wave packets propagate over asurface with a MIM structure. The resonance nature of the SPP-cavityinteraction is reflected as strong modulations in the spectra of transmittedand reflected SPP wavepackets, which show peaks and valleys, respectively,corresponding to the MIM cavity's eigenmode. These features indicate that theMIM structure acts as a Fabry-Perot etalon-type spectrum filter. Withappropriate tuning of the resonance frequency of the cavity, one can extract awave packet with a narrower time duration and temporally shifted intensitypeak.

optics express

Spectral and temporal modulations of femtosecond SPP wave packets  induced by resonant transmission/reflection interactions with  metal-insulator-metal nanocavities