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Nanoscale Research Letters

, 7:546

First Online: 02 October 2012Received: 23 August 2012Accepted: 24 September 2012


The two apexes of an elongated gold nanorod GNR irradiated by a plane wave are shown to be the hotspots at the longitudinal plasmon modes. This phenomenon implies that a pair of quantum dots QDs located at these apexes might be excited simultaneously if the excitation band of QDs coincides with one of these modes. Consequently, a coherent emission of the two emitters could happen subsequently. In the following coherent emission, these two-level emitters are simulated as two oscillating dipoles bi-dipole with some possible phase differences. Our results show that the maximum radiative and nonradiative powers of the bi-dipole occur at the longitudinal plasmon dipole, quadrupole, sextupole, and octupole modes of GNR. Moreover, the strongest emissions are induced by the in-phase bi-dipole coupled to the odd modes and the 180° out-of-phase one to the even modes, respectively. The excitation and emission behaviors of a pair of QDs incorporated with GNR demonstrate the possibility of using this structure as a subwavelength resonator of Fabry-Perot type. In addition, the correlation between these modes of the GNR and the dispersion relation of gold nanowire is also discussed.

KeywordsGold nanorod Quantum dot Longitudinal plasmon mode Fabry-Perot resonator Radiative power Nonradiative power Gold nanowire Bi-dipole AbbreviationsACSabsorption cross section

ARaspect ratio

ECSextinction cross section

EELSelectric energy loss spectroscopy

GNRgold nanorod

GNWgold nanowire

MMPmultiple multipole


QDquantum dot

SCSscattering cross section.

Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-7-546 contains supplementary material, which is available to authorized users.

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Autor: Jiunn-Woei Liaw - Chun-Hui Huang - Bae-Renn Chen - Mao-Kuen Kuo


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