title: Enhanced second harmonic generation from Au nanoparticle arrays by femtosecond laser irradiation.
abstract: 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.
authors.affiliation: Department of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Marry's, Boston, Massachusetts 02215, USA.
authors.forename: Gary F
authors.initials: GF
authors.lastname: Walsh
authors.forename: Luca
authors.initials: L
authors.lastname: Dal Negro
mesh_terms: D006046:Gold / Q000737:chemistry*; D007834:Lasers; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation; D013997:Time Factors
chemical_list: D006046:Gold