Abstract

We demonstrate subpicosecond control over the coupling of free-space radiation to surface-plasmon polaritons using 830 and $500\mathrm{nm}$ period gold gratings. Thermal changes to the electron distribution following irradiation by $100\mathrm{fs}$, $810\mathrm{nm}$ pulses produce a shift of the $570\mathrm{nm}$ plasmon resonance by $\sim 0.75\mathrm{nm}$ with reflectivity change up to 6% and decay time of $\sim 1\mathrm{ps}$.

© 2008 Optical Society of America

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