Optical nonlinearities of Au nanoparticles and Au/Ag coreshells.
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.
Seo
Jae Tae
JT
Department of Physics, Hampton University, Hampton, VA 23668, USA. jaetae.seo@hamptonu.edu
Yang
Qiguang
Q
Kim
Wan-Joong
WJ
Heo
Jinhwa
J
Ma
Seong-Min
SM
Austin
Jasmine
J
Yun
Wan Soo
WS
Jung
Sung Soo
SS
Han
Sang Woo
SW
Tabibi
Bagher
B
Temple
Doyle
D
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*
D012834:Silver; D006046:Gold