Abstract
We study the dephasing of polaritons excited in metallic photonic crystal slabs where surface plasmons of metallic nanoparticles are coupled with waveguide modes in the substrate. The dephasing times measured by nonlinear interferometric autocorrelation techniques employing sub-15 fs laser pulses can be increased by more than a factor of two as compared to the pure particle plasmon coherence time if the two resonances are strongly coupled. Such coupling leads to strong modifications of the second harmonic spectrum.
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