Fig. 3: Recorded FREHD interferograms for an optically excited gold nanoprism.
From: Attosecond electron microscopy by free-electron homodyne detection
a, Spatial scans of the magnitude of the total phase modulation for four different values of the reference phase ϕref. b, Interferograms (∣gtotal∣2 as a function of relative phase) at the pixel positions indicated by the colour-coordinated dots in a (bottom right) and c (solid lines, sinusoidal fits). c, Dark-field image of the nanoprism.
