In this report, we investigate the statistical temporal distribution of nonlinear upconverted photoluminescence emitted by gold and silver nanostructures excited by focused near-infrared laser pulses. We systematically observe a clear signature of photon bunching regardless of the nano-object’s geometry, material’s crystalline arrangement, and electronic band structure. The similarity of the data obtained across very different plasmonic objects confirms that these types of nonlinear radiation share a common chaotic origin and result from a collection of emitters. The correlation of photons at a picosecond time scale released by nanoscale nonlinear sources of broadband radiation may be used in plasmonic devices to develop new data temporal and spatial processing functionalities.

中文翻译：

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等离子体金属发出的非线性光致发光的光子聚集

在本报告中，我们研究了由聚焦近红外激光脉冲激发的金和银纳米结构发出的非线性上转换光致发光的统计时间分布。无论纳米物体的几何形状，材料的晶体排列和电子能带结构如何，我们系统地观察到光子聚集的清晰特征。在非常不同的等离子物体上获得的数据的相似性证实，这些类型的非线性辐射具有共同的混沌起源，并且是由发射体的集合导致的。宽带辐射的纳米级非线性源释放的皮秒级时间尺度的光子相关性可用于等离激元设备中，以开发新的数据时间和空间处理功能。