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JOURNAL ARTICLE

Enhanced second harmonic generation from Au nanoparticle arrays by femtosecond laser irradiation

Gary F Walsh, Luca Dal Negro

Nanoscale 2013 September 7, 5 (17): 7795-9

Ultrafast laser irradiation of planar Au nanoparticle arrays is shown to double the particle plasmon quality factor and to enhance second harmonic generation 40-fold. It is found that the irradiation induces a morphological change of nano-cylinders into asymmetric droplet-like shapes with reduced surface roughness without altering their lithographically defined locations. These findings can be used to improve the performance of linear and nonlinear plasmonic devices.

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Enhanced second harmonic generation from Au nanoparticle arrays by femtosecond laser irradiation

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