High-energy (1–100 keV) electrons can coherently couple to plasmonic and dielectric nanostructures, creating cathodoluminescence (CL) of which the spectral features reveal details of the material’s resonant modes at a deep-subwavelength spatial resolution. While CL provides fundamental insight in optical modes, detecting its phase has remained elusive. Here, we use Fourier-transform CL holography to determine the far-field phase distribution of fields scattered from plasmonic nanoholes, nanocubes, and helical nanoapertures and reconstruct the angle-resolved phase distributions. From the derived fields, we derive the relative strength and phase of induced scattering dipoles. Fourier-transform CL holography opens up a new world of coherent light scattering and surface wave studies with nanoscale spatial resolution.

中文翻译：

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通过阴极发光全息术探测相分辨表面等离子体散射。

高能（1-100 keV）电子可以与等离子体和介电纳米结构相干耦合，产生阴极发光（CL），其光谱特征以深亚波长空间分辨率揭示材料共振模式的细节。虽然 CL 提供了光学模式的基本见解，但检测其相位仍然难以捉摸。在这里，我们使用傅里叶变换 CL 全息术来确定从等离子体纳米孔、纳米立方体和螺旋纳米孔径散射的场的远场相位分布，并重建角度分辨相位分布。从导出的场中，我们导出了诱导散射偶极子的相对强度和相位。傅里叶变换 CL 全息术开辟了具有纳米级空间分辨率的相干光散射和表面波研究的新世界。