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Cavity quantum electrodynamic analysis of spasing in nanospherical dimers

机译：纳米球形二聚体的空洞量子电动力学分析

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摘要

We present a detailed cavity quantum electrodynamic model of a nanospherical dimer and use it to analyze bright hybrid spasing modes there. Using an approximate numerical scheme, we model the complete spasing system as an open quantum system under the Lindblad dissipator formalism. We show that while in general the longitudinal dimer setups display higher intensity spasing as compared with transverse dimers, the latter actually consistently lead to output with higher coherence. Intriguingly, and somewhat counterintuitively, we find that transverse dimers only reach peak output at an intermediate dimer separation at which field confinement is not the strongest. We show that this is due to low radiative decay rates of transverse dimers with significant dimer gaps. We also find that transverse dimers outperform longitudinal dimers in terms of output intensity in a weakly pumped sparse gain medium made of dimers with relatively large separations. Moreover, in all the configurations considered, we find that the second-order coherence of the spasing output shows a peaked behavior just before the threshold, suggesting that the coherence is a useful indicator of spasing. Even though the scheme we describe is focused on dimers, owing to the generic form of the analysis presented, it can be easily extended to investigate spasing in the bright modes of multiple coupled plasmon sources.
机译：我们提出了一个纳米球形二聚体的详细的腔量子电动力学模型，并用它来分析那里明亮的混合射束模式。使用近似数值方案，我们在Lindblad耗散器形式主义的指导下，将完整的散裂系统建模为开放量子系统。我们显示，虽然一般而言，纵向二聚体设置与横向二聚体相比显示出更高的强度抽签，但横向二聚体实际上始终导致输出具有更高的相干性。有趣的是，与直觉相反，我们发现横向二聚体仅在中间二聚体分离处达到峰值输出，在该中间二聚体分离处，场约束不是最强的。我们表明这是由于具有明显二聚体间隙的横向二聚体的辐射衰减率低。我们还发现，在由相对较大间隔的二聚体构成的弱泵浦稀疏增益介质中，横向二聚体的性能优于纵向二聚体。此外，在所有考虑的配置中，我们发现，抽空输出的二阶相干性在阈值之前显示出峰值行为，这表明该连贯性是抽空的有用指示。即使我们描述的方案集中在二聚体上，由于所呈现的分析形式通用，它也可以很容易地扩展以研究多重耦合等离子体激元源的亮模式下的痉挛。

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  • 来源
    《Physical review》 |2019年第8期|085439.1-085439.13|共13页
  • 作者

    Warnakula Tharindu; Gunapala Sarath D.; Stockman Mark I; Premaratne Malin;

  • 作者单位

    Monash Univ Dept Elect & Comp Syst Engn Adv Comp & Simulat Lab AXL Clayton Vic 3800 Australia;

    CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA;

    Georgia State Univ Dept Phys & Astron Atlanta GA 30303 USA;

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