title: THz generation from plasmonic nanoparticle arrays.
abstract: We investigate the generation of THz pulses when arrays of silver nanoparticles are irradiated by femtosecond laser pulses, providing the first reproducible experimental evidence in support of recent theoretical predictions of such an effect. We assess our results in the context of a model where photoelectrons are produced by plasmon-mediated multiphoton excitation, and THz radiation is generated via the acceleration of the ejected electrons by ponderomotive forces arising from the inhomogeneous plasmon field. By exploring the dependence of the THz emission on the femtosecond pulse intensity and as a function of metal nanoparticle morphology, and by comparing measurements to numerical modeling, we are able to verify the role of the particle plasmon mode in this process.
authors: School of Physics and Astronomy, Exeter EX4 4Ql, United Kingdom.
authors: D K
authors: DK
authors: Polyushkin
authors: E
authors: E
authors: Hendry
authors: E K
authors: EK
authors: Stone
authors: W L
authors: WL
authors: Barnes
mesh_terms: D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*; D055053:Terahertz Radiation