Large spontaneous emission enhancement in plasmonic nanocavities
Large spontaneous emission enhancement in plasmonic nanocavities
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DOI：
10.1038/nphoton.2012.112
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发表时间：
2012-07-01
期刊：
影响因子：
35
通讯作者：
Hu, Evelyn L.
中科院分区：
文献类型：
--
作者：
Russell, Kasey J.;Liu, Tsung-Li;Hu, Evelyn L.
从低阈值激光器到更明亮的单光子源，用于量子密码学（1），从量子光学元件到更明亮的单光源，腔发射机耦合可以实现许多潜在的应用。尽管在金属结构中发生了一些自发发射修饰的第一次演示（2,3），但直到最近在介电光腔中腔量子量子电动力学效应（4）之后才考虑量子光学的量子。申请（5-13）。金属光腔的优势包括它们与各种发射器及其宽带腔光谱的兼容性，从而可以增强光谱宽阔的发射器。在这里，我们证明了辐射发射速率的增强，接近1,000的发射器，与银纳米线和银底物之间的纳米级间隙相连。我们的结果与分析理论的定量比较表明，尽管金属表面近距离接近，但我们结构中间隙模式等离子体的发射速率的增强可能会产生高的内部量子效率。
Cavity-emitter coupling can enable a host of potential applications in quantum optics, from low-threshold lasers to brighter single-photon sources for quantum cryptography(1). Although some of the first demonstrations of spontaneous emission modification occurred in metallic structures(2,3), it was only after the recent demonstration of cavity quantum electrodynamics effects in dielectric optical cavities(4) that metal-based optical cavities were considered for quantum optics applications(5-13). Advantages of metal-optical cavities include their compatibility with a large variety of emitters and their broadband cavity spectra, which enable enhancement of spectrally broad emitters. Here, we demonstrate radiative emission rate enhancements approaching 1,000 for emitters coupled to the nanoscale gap between a silver nanowire and a silver substrate. A quantitative comparison of our results with analytical theory shows that the enhanced emission rate of gap-mode plasmons in our structures can yield high internal quantum efficiency despite the close proximity of metal surfaces.