Quantum optics with swift electrons

摘要

a Conventional cathodoluminescence and electron energy-loss spectroscopy, where spontaneous interactions are responsible. b In a reciprocal approach to cathodoluminescence spectroscopy, the PINEM field addresses stimulated interactions. Depending on the laser intensity, multiphoton processes can lead to a complete depletion of the so-called zero-loss peak (black dashed arrow; Nanostar image, courtesy of Masoud Taleb and Maximilian Black, Kiel University).