Journal
NANO LETTERS
Volume 12, Issue 5, Pages 2488-2493Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl300655n
Keywords
Surface plasmon; spontaneous emission; Purcell factor; quantum emitter; quantum interference
Categories
Funding
- National Natural Science Foundation of China [91121018, 11121091]
- National Key Basic Research Program [2007CB307001]
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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.
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