论文标题
$μ$ EV电子光谱镜使用自由空间光
$μ$eV electron spectromicroscopy using free-space light
论文作者
论文摘要
最近利用了自由电子和光之间的协同作用，以达到令人印象深刻的同时空间和光谱分辨率，从而在显微镜和量子光学方面应用了应用。但是，将电子光学和光注射到任意标本的光谱狭窄模式中所需的组合仍然是一个挑战。在这里，我们在光子模式的纳米级映射中证明了微电伏频谱分辨率，其质量因子高达10 $^4 $。我们依靠密切聚焦的激光束的模式匹配来窃窃私图库模式，以实现10 $^8 $倍的光电子耦合效率。通过调整自由空间光束的形状和大小来解决特定的物理问题，我们的方法使我们能够以前所未有的光谱和空间细节来询问任何类型的光子结构
The synergy between free electrons and light has recently been leveraged to reach an impressive degree of simultaneous spatial and spectral resolution, enabling applications in microscopy and quantum optics. However, the required combination of electron optics and light injection into the spectrally narrow modes of arbitrary specimens remains a challenge. Here, we demonstrate microelectronvolt spectral resolution in the nanoscale mapping of photonic modes with quality factors as high as 10$^4$. We rely on mode-matching of a tightly focused laser beam to whispering gallery modes to achieve a 10$^8$-fold increase in light-electron coupling efficiency. By adapting the shape and size of free-space optical beams to address specific physical questions, our approach allows us to interrogate any type of photonic structure with unprecedented spectral and spatial detail
