title: Efficient surface plasmon amplification from gain-assisted gold nanorods.
abstract: We report on the efficient surface plasmon amplification by stimulated emission of radiation (spaser) from a gold nanorod coated with proper gain media. Numerical simulations show that the threshold of the nanorod-based spaser is nearly 1 order of magnitude lower than that of the core-shell nanosphere, which is verified by analysis with electrostatic theory. Furthermore, it is found that the nanorod-based nanosystem possesses unique optical properties such as wavelength tunability and polarization sensitivity.
authors.affiliation: Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China.
authors.forename: Si-Yun
authors.initials: SY
authors.lastname: Liu
authors.forename: Jiafang
authors.initials: J
authors.lastname: Li
authors.forename: Fei
authors.initials: F
authors.lastname: Zhou
authors.forename: Lin
authors.initials: L
authors.lastname: Gan
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Li