Plasmon-emitter interactions are of central importance in modern nanoplasmonics and are generally maximal at short emitter-surface separations. However, when the separation falls below 10-20 nm, the classical theory deteriorates progressively due to its neglect of quantum effects such as nonlocality, electronic spill-out, and Landau damping. Here we show how this neglect can be remedied in a unified theoretical treatment of mesoscopic electrodynamics incorporating Feibelman [Formula: see text]-parameters. Our approach incorporates nonclassical resonance shifts and surface-enabled Landau damping-a nonlocal damping effect-which have a dramatic impact on the amplitude and spectral distribution of plasmon-emitter interactions. We consider a broad array of plasmon-emitter interactions ranging from dipolar and multipolar spontaneous emission enhancement, to plasmon-assisted energy transfer and enhancement of two-photon transitions. The formalism gives a complete account of both plasmons and plasmon-emitter interactions at the nanoscale, constituting a simple yet rigorous platform to include nonclassical effects in plasmon-enabled nanophotonic phenomena.

中文翻译：

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纳米级的等离子-发射极相互作用。

等离子体-发射极相互作用在现代纳米等离激元学中至关重要，通常在较短的发射极-表面间距处最大。但是，当分离度降至10-20 nm以下时，由于忽略了量子效应（例如非局域性，电子溢出和Landau阻尼），经典理论逐渐恶化。在这里，我们展示了如何在结合Feibelman [公式：参见文本]参数的介观电动力学的统一理论处理中，可以消除这种疏忽。我们的方法结合了非经典的共振位移和表面激活的Landau阻尼（一种非局部阻尼效应），这对等离激元-发射极相互作用的幅度和频谱分布产生了巨大影响。我们考虑了一系列等离激元-发射极相互作用，包括偶极和多极自发发射增强，等离子体激元辅助的能量转移和双光子跃迁的增强。形式主义完整地说明了纳米级的等离激元和等离激元-发射极相互作用，构成了一个简单而严谨的平台，可将非经典效应包括在等离激元使能的纳米光子现象中。