等离子体纳米结的本征发光闪烁
Intrinsic Luminescence Blinking from Plasmonic Nanojunctions
摘要：
等离子体纳米结由具有纳米间隙的相邻金属结构组成，可以支持局部等离子体共振，从而增强轻物质相互作用并将电磁场集中在纳米级。在这种制度下，系统的光学响应是由在散装，分子和原子尺度之间的边界知之甚少的动力学现象。在这里，我们报告无处不在的光谱波动的内在光发射从光激发的金纳米结，我们归因于光诱导形成的域边界和量子限制发射器内的贵金属。我们的数据表明，光激发载流子和金吸附原子-分子相互作用在触发发光闪烁中起关键作用。令人惊讶的是，金属的这种内部重组对等离子体腔的拉曼信号和散射光谱没有可测量的影响。我们的研究结果表明，金属发光提供了一个有价值的代理调查等离子体腔中的原子波动，补充其他光学和电学技术。
英文摘要：
Plasmonic nanojunctions, consisting of adjacent metal structures with nanometre gaps, can support localised plasmon resonances that boost light matter interactions and concentrate electromagnetic fields at the nanoscale. In this regime, the optical response of the system is governed by poorly understood dynamical phenomena at the frontier between the bulk, molecular and atomic scales. Here, we report ubiquitous spectral fluctuations in the intrinsic light emission from photo-excited gold nanojunctions, which we attribute to the light-induced formation of domain boundaries and quantum-confined emitters inside the noble metal. Our data suggest that photoexcited carriers and gold adatom - molecule interactions play key roles in triggering luminescence blinking. Surprisingly, this internal restructuring of the metal has no measurable impact on the Raman signal and scattering spectrum of the plasmonic cavity. Our findings demonstrate that metal luminescence offers a valuable proxy to investigate atomic fluctuations in plasmonic cavities, complementary to other optical and electrical techniques.
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