标题： 纳米间隙中的光发射：克服猝灭 显示英文标题

标题： Light emission in nanogaps: overcoming quenching

摘要： 非常大的自发发射率增强(~1000)可以通过量子发射器与微小等离子体共振耦合获得，特别是当发射器放置在由几乎接触的金属纳米颗粒形成的纳米间隙的开口处时。这种亚波长尺度上的发光基本效应已被广泛记录并理解为纳米间隙模式的小尺寸所致。相比之下，确定这些间隙中的辐射效率是否高，或者发射是否因金属吸收而被抑制，尤其是在几纳米宽的微小间隙中，却要不那么明显；整个文献中只有零散的电磁计算，这些计算表明，尽管发射器靠近金属，吸收和淬灭仍可以保持在较低水平。因此，通过在小间隙厚度极限下的分析推导，我们的目标是阐明为什么纳米间隙天线中的量子发射器具有良好的效率，获得高效率的条件是什么，以及是否存在可实现的最大效率的上限。 显示英文摘要

摘要： Very large spontaneous-emission-rate enhancements (~1000) are obtained for quantum emitters coupled with tiny plasmonic resonance, especially when emitters are placed in the mouth of nanogaps formed by metal nanoparticles that are nearly in contact. This fundamental effect of light emission at subwavelength scales is well documented and understood as resulting from the smallness of nanogap modes. In contrasts, it is much less obvious to figure out whether the radiation efficiency is high in these gaps, or if the emission is quenched by metal absorption especially for tiny gaps a few nanometers wide; the whole literature only contains scattered electromagnetic calculations on the subject, which suggest that absorption and quenching can be kept at a small level despite the emitter proximity to metal. Thus through analytical derivations in the limit of small gap thickness, it is our objective to clarify why quantum emitters in nanogap antennas offer good efficiencies, what are the circumstances in which high efficiency is obtained, and whether there exists an upper bound for the maximum efficiency achievable.