title: Surface plasmons amplifications in single Ag nanoring.
abstract: The stimulated amplifications of surface plasmons (SPs) propagating along a single silver nanoring is theoretically investigated by considering the interactions between SPs and activated semiconductor quantum dots (SQDs). Threshold condition for the stimulated amplifications, the SP density as a function of propagation length and the maximum SP density are obtained. The SPs can be nonlinearly amplified when the pumping rate of SQDs is larger than the threshold, and the maximum value of SP density increases linearly with the pumping rate of SQDs.
authors.affiliation: Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072, PR China.
authors.forename: Zhong-Jian
authors.initials: ZJ
authors.lastname: Yang
authors.forename: Nam-Chol
authors.initials: NC
authors.lastname: Kim
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Li
authors.forename: Mu-Tian
authors.initials: MT
authors.lastname: Cheng
authors.forename: Shao-Ding
authors.initials: SD
authors.lastname: Liu
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Hao
authors.forename: Qu-Quan
authors.initials: QQ
authors.lastname: Wang