Abstract
We propose and demonstrate an ultrafast all-optical method to couple light to surface plasmon polaritons on planar gold films. By interfering two 150fs, 810nm pulses we excite a transient grating in the temperature of the free electrons of the metal, resulting in a grating in the dielectric function, and leading to a 1ps launch window for plasmonic excitation. We use pump-probe experiments to identify these ultrashort plasmonic excitations between 520 and 570nm.
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