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Figure 8. Electron-photon interaction and quantum control in UTEM. (A) Electron energy spectra for interaction with and without photons. Reprinted with permission^[141]. Copyright 2009, Springer Nature. (B) Ultrafast PINEM imaging of phonon-polariton in hBN. Reprinted with permission^[150]. Copyright 2021, AAAS. (C) PINEM imaging of electron interaction with optical Bloch mode inside photonic crystals. Reprinted with permission^[155]. Copyright 2020, Springer Nature. (D) Resonant phase-matching between a light wave and a free-electron wavefunction. Reprinted with permission^[157]. Copyright 2020, Springer Nature.