The interaction between free electrons and optical modes underlies a variety of quantum and nanoscale light-matter phenomena, yet the associated momentum exchange with the sample largely remained overlooked. Here, we experimentally demonstrate the momentum transfer from free electrons to planar samples during optical mode excitation using momentum-resolved electron energy-loss spectroscopy. The momentum transfer to the sample modifies the apparent dispersion relation which is significant when the planar sample is tilted. Under specific conditions, the sample receives momentum opposite to the electron beam direction.

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• Electron beams & optics
• Optical forces
• Plasmonics
• Electron diffraction
• Electron energy loss spectroscopy
• Electron microscopy