title: Optical nonlinearities of Au nanoparticles and Au/Ag coreshells.
abstract: Au nanoparticles exhibited both negative and positive nonlinear absorptions with ground-state plasmon bleaching and free-carrier absorption that could be origins of the saturable and reverse-saturable optical properties. Au/Ag coreshells displayed only positive nonlinear absorption and reverse-saturable optical properties as a function of excitation intensity at the edge of surface-plasmon resonance, which implies no ground-state plasmon bleaching and the existence of two-photon absorption.
authors.affiliation: Department of Physics, Hampton University, Hampton, VA 23668, USA. jaetae.seo@hamptonu.edu
authors.forename: Jae Tae
authors.initials: JT
authors.lastname: Seo
authors.forename: Qiguang
authors.initials: Q
authors.lastname: Yang
authors.forename: Wan-Joong
authors.initials: WJ
authors.lastname: Kim
authors.forename: Jinhwa
authors.initials: J
authors.lastname: Heo
authors.forename: Seong-Min
authors.initials: SM
authors.lastname: Ma
authors.forename: Jasmine
authors.initials: J
authors.lastname: Austin
authors.forename: Wan Soo
authors.initials: WS
authors.lastname: Yun
authors.forename: Sung Soo
authors.initials: SS
authors.lastname: Jung
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Han
authors.forename: Bagher
authors.initials: B
authors.lastname: Tabibi
authors.forename: Doyle
authors.initials: D
authors.lastname: Temple
mesh_terms: D003198:Computer Simulation; D006046:Gold / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D017711:Nonlinear Dynamics; D010316:Particle Size; D012542:Scattering, Radiation; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D012834:Silver; D006046:Gold