title: Resonance amplification of left-handed transmission at optical frequencies by stimulated emission of radiation in active metamaterials.
abstract: We demonstrate that left-handed resonance transmission from metallic metamaterial, composed of periodically arranged double rings, can be extended to visible spectrum by introducing an active medium layer as the substrate. The severe ohmic loss inside metals at optical frequencies is compensated by stimulated emission of radiation in this active system. Due to the resonance amplification mechanism of recently proposed lasing spaser, the left-handed transmission band can be restored up to 610 nm wavelength, in dependence on the gain coefficient of the active layer. Additionally, threshold gains for different scaling levels of the double-ring unit are investigated to evaluate the gain requirement of left-handed transmission restoration at different frequency ranges.
authors.affiliation: Physics Department, Southeast University, Nanjing 211189, People's Republic of China.
authors.forename: Zheng-Gao
authors.initials: ZG
authors.lastname: Dong
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Zhu
authors.forename: Shu-Ming
authors.initials: SM
authors.lastname: Wang
authors.forename: Jing-Xiao
authors.initials: JX
authors.lastname: Cao
authors.forename: Shi-Ning
authors.initials: SN
authors.lastname: Zhu
authors.forename: X
authors.initials: X
authors.lastname: Zhang
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D055096:Optical Devices; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*