Abstract
Spontaneous emission lifetime orientation distributions of a two-level quantum emitter in metallic nanorod structures are theoretically investigated by the rigorous electromagnetic Green function method. It was found that spontaneous emission lifetime strongly depended on the transition dipole orientation and the position of the emitter. The anisotropic factor defined as the ratio between the maximum and minimum values of the lifetimes along different dipole orientations can reach up to 103. It is much larger than those in dielectric structures which are only several times usually. Our results show that the localized plasmonic resonance effect provides a new degree of freedom to effectively control spontaneous emission by the dipole orientation of the quantum emitters.
Highlights
Spontaneous emission (SE) control of quantum emitters (QEs) is of great importance in basic quantum optics researches and new type of quantum information devices design due to its diverse range of applications such as solar energy harvesting [1,2], light-emitting diodes [3,4], miniature lasers [5,6], and single-photon source for quantum information science [7,8].It is well known that, the spontaneous emission lifetime of QEs can be strongly modulated by the surrounding environment
Metallic nanostructures have attracted extensive of interest as they support surface plasmonic resonances, which are the collective oscillations of the electron gas in metals [14,15]
In this paper, the dielectric constant of the gold nanorod is obtained by fitting the experimental data from Johnson and Christy with piecewise cubic interpolation [37]
Summary
Spontaneous emission (SE) control of quantum emitters (QEs) is of great importance in basic quantum optics researches and new type of quantum information devices design due to its diverse range of applications such as solar energy harvesting [1,2], light-emitting diodes [3,4], miniature lasers [5,6], and single-photon source for quantum information science [7,8]. Surface plasmons may greatly enhance the local electromagnetic field that leads to nanoscale ‘hot spots’ [16,17] Such local enhancement capability enables the quantum control of the SE process at nanoscale [18,19,20,21,22,23]. In [24], the SE enhancement of a single quantum dot coupled to silver nanowire was successfully measured. Such measurements proved that the SE exhibits antibunching. Reported before in photonic crystals and dielectric sphere structures [11,31,32]
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