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Phys Rev Lett. 2003 Oct 3;91(14):143901. Epub 2003 Sep 30.

Microscopic origin of surface-plasmon radiation in plasmonic band-gap nanostructures.

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  • 1School of Physics, Seoul National University, Seoul 151-742, Korea.


We report spatial domain measurements of the damping of surface-plasmon excitations in metal films with periodic nanohole arrays. The measurements reveal a short coherent propagation length of a few microm inside nanohole arrays, consistent with delays of about 10 fs in ultrafast transmission experiments. This implies that the transmission spectra of the entire plasmonic band-gap structure are homogeneously broadened by radiative damping of surface-plasmon excitations. We show that a Rayleigh-like scattering of surface plasmons by the periodic hole array is the microscopic origin of this damping, allowing the reradiation rate to be controlled.

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