title: Surface-plasmon-induced modification on the spontaneous emission spectrum via subwavelength-confined anisotropic Purcell factor.
abstract: The mechanism of using the anisotropic Purcell factor to control the spontaneous emission linewidths in a four-level atom is theoretically demonstrated; if the polarization angle bisector of the two dipole moments lies along the axis of large/small Purcell factor, destructive/constructive interference narrows/widens the fluorescence center spectral lines. Large anisotropy of the Purcell factor, confined in the subwavelength optical mode volume, leads to rapid spectral line narrowing of atom approaching a metallic nanowire, nanoscale line width pulsing following periodically varying decay rates near a periodic metallic nanostructure, and dramatic modification on the spontaneous emission spectrum near a custom-designed resonant plasmon nanostructure. The combined system opens a good perspective for applications in ultracompact active quantum devices.
authors.affiliation: State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China. ygu@pku.edu.cn
authors.forename: Ying
authors.initials: Y
authors.lastname: Gu
authors.forename: Luojia
authors.initials: L
authors.lastname: Wang
authors.forename: Pan
authors.initials: P
authors.lastname: Ren
authors.forename: Junxiang
authors.initials: J
authors.lastname: Zhang
authors.forename: Tiancai
authors.initials: T
authors.lastname: Zhang
authors.forename: Olivier J F
authors.initials: OJ
authors.lastname: Martin
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong