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Spontaneous decay of a single quantum dot coupled to a metallic slot waveguide in the presence of leaky plasmonic modes
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论文类型：期刊论文
发表刊物：Optics Express
所属单位：DTU Fotonik, Department of Photonics Engineering, Ørsteds Plads, Building 343, DK- 2800 Kgs. Lyngby,
刊物所在地：美国
学科门类：工学
项目来源：自然科学基金
文献类型：J
卷号：18
期号：12
页面范围：12489
关键字：Surface plasmons，Waveguides，Sources，Quantum electrodynamics.
DOI码：10.1364/OE.18.012489
发表时间：2010-06-07
摘要：We numerically investigate the coupling efficiency of a single self-assembled quantum dot to a metallic slot waveguide in the presence of leaky plasmonic modes. Leaky plasmonic modes refer to radiation modes with plasmonic features, resulting from the inhomogeneity of the dielectric environment in which the metallic slot waveguide is embedded. Compared to the ideal case of a homogenous dielectric environment, the coupling efficiency of an emitter to a metallic slot waveguide is significantly reduced. We attribute the reduction to the coupling to leaky plasmonic modes. By increasing the refractive index of the coating layer to minimize the impacts from the leaky plasmonic modes, we find that the coupling efficiency of the quantum dot to the single mode supported by the metallic slot waveguide can be enhanced by more than a factor 2.
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