title: Highly efficient avalanche multiphoton luminescence from coupled Au nanowires in the visible region.
abstract: We demonstrate highly efficient avalanche multiphoton luminescence (MPL) from ordered-arrayed gold nanowires (NWs) with low time-average excitation intensity, Iexc (5.0-9.1 kW/cm2). The intensity of avalanche MPL, IMPL, is about 10(4) times larger than that of three-photon luminescence, the slope partial differential log IMPL/ partial differential log Iexc of avalanche MPL reaches as high as 18.3, and the corresponding polarization dependence of IMPL has a form of cos50 phip. The emission dynamics of avalanche MPL and three-photon luminescence are also studied comparatively. These observations indicate that the highly efficient avalanche MPL is attributed to the giant enhancement and coupling of longitudinal surface plasmon resonance of ordered-arrayed gold NWs.
authors.affiliation: Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072, P. R. China. qqwang@whu.edu.cn
authors.forename: Qu-Quan
authors.initials: QQ
authors.lastname: Wang
authors.forename: Jun-Bo
authors.initials: JB
authors.lastname: Han
authors.forename: Dong-Lai
authors.initials: DL
authors.lastname: Guo
authors.forename: Si
authors.initials: S
authors.lastname: Xiao
authors.forename: Yi-Bo
authors.initials: YB
authors.lastname: Han
authors.forename: Hong-Mei
authors.initials: HM
authors.lastname: Gong
authors.forename: Xian-Wu
authors.initials: XW
authors.lastname: Zou