Ultrafast Kapitza-Dirac effect
arXiv:2404.00304 · doi:10.1126/science.adn1555
Abstract
Similar to the optical diffraction of light passing through a material grating, the Kapitza-Dirac effect occurs when an electron is diffracted by a standing light wave. In its original description the effect is time-independent. In the present work, we extend the Kapitza-Dirac concept to the time domain. By tracking the spatiotemporal evolution of a pulsed electron wave packet diffracted by a femtosecond (10 15 second) standing wave pulse in a pump-probe scheme, we observe so far unseen time-dependent diffraction patterns. The fringe spacing in the observed pattern differs from that generated by the conventional Kapitza-Dirac effect, moreover it decreases as the pump-probe delay time increases. By exploiting this time-resolved diffraction scheme, we gather access to the time evolution of the previously inaccessible phase properties of a free electron.
References in corpus (13)
- Gravity surveys using a mobile atom interferometer
- Coherent interaction between free electrons and a photonic cavity
- Breakdown of the Dipole Approximation in Strong-Field Ionization
- Ponderomotive generation and detection of attosecond free-electron pulse trains
- Diffraction of complex molecules by structures made of light
- Magnetic fields alter tunneling in strong-field ionization
- Design of an electron microscope phase plate using a focused continuous-wave laser
- Transverse Electron Beam Shaping with Light
- The Kapitza - Dirac effect
- Spin-polarizing interferometric beam splitter for free electrons
- Angular dependence of the Wigner time delay upon tunnel ionization of
- Quantum decoherence by Coulomb interaction
- Holographic Angular Streaking of Electrons and the Wigner-Time Delay