The spatial and temporal coherence of the fluorescence emission controlled by a quasi‐two‐dimensional hybrid photonic–plasmonic crystal structure covered with a thin fluorescent‐molecular‐doped dielectric film is investigated experimentally. A simple theoretical model to describe how a confined quasi‐two‐dimensional optical mode may induce coherent fluorescence emission is also presented. Concerning the spatial coherence, it is experimentally observed that the coherence area in the plane of the light source is in excess of 49 μm², which results in enhanced directional fluorescence emission. Concerning temporal coherence, the obtained coherence time is 4 times longer than that of the normal fluorescence emission in vacuum. Moreover, a Young's double‐slit interference experiment is performed to directly confirm the spatially coherent emission. This smoking gun proof of spatial coherence is reported here for the first time for the optical‐mode‐modified emission.

中文翻译：

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通过使用混合光子-等离激元晶体来产生相干荧光。

实验研究了由薄二维荧光掺杂电介质膜覆盖的准二维混合光子-等离子晶体结构控制的荧光发射的时空相干性。还提出了一个简单的理论模型来描述有限的准二维光学模式如何诱发相干荧光发射。关于空间相干性，通过实验观察到，在光源的平面上的相干性区域是过量为49μm ²，导致定向荧光发射增强。关于时间相干，获得的相干时间是真空中正常荧光发射的相干时间的4倍。此外，还进行了一次杨氏双缝干涉实验，以直接确认空间相干发射。首次报道了这种烟枪的空间相干性证明，用于光学模式修改的发射。