Subwavelength Fabry-Perot resonator: a pair of quantum dots incorporated with gold nanorodReportar como inadecuado




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Nanoscale Research Letters

, 7:546

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

Abstract

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

NIRnear-infrared

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

Fuente: https://link.springer.com/







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