Enhanced third-order optical nonlinearity of silver nanoparticles with a tunable surface plasmon resonance.
Poly(vinylalcohol) (PVA)-stabilized silver nanoparticles were prepared by a seeding method. Nanoparticles of varying morphology were obtained by controlled variation of the reaction conditions, and this method allowed the tailoring of the position of the surface plasmon resonance. The samples show two bands in the visible absorption spectrum: one in the 410-440-nm region and a second peak between 500 and 600 nm. This tunable surface plasmon resonance serves to increase the third-order optical nonlinearity (chi 3) of the nanoparticles (measured at 532 nm) by a factor of 16.
Whelan
Aine M
AM
Department of Chemistry, Trinity College, Dublin 2, Ireland.
Brennan
Margaret E
ME
Blau
Werner J
WJ
Kelly
John M
JM
D003460:Crystallization / Q000379:methods*; D008422:Materials Testing; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D017711:Nonlinear Dynamics; D010316:Particle Size; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
D012834:Silver; D011142:Polyvinyl Alcohol