Phys.org June 6, 2024 All-optical generation of photonic vortices requires sufficiently strong nonlinearity that is typically achieved in the classical optics regime. Researchers in Israel realized quantum vortices of photons that resulted from a strong photon-photon interaction in a quantum nonlinear optical medium. The interaction caused faster phase accumulation for copropagating photons, producing a quantum vortex-antivortex pair within the two-photon wave function. For three photons, the formation of vortex lines and a central vortex ring confirmed the existence of a genuine three-photon interaction. The wave function topology, governed by two- and three-photon bound states, imposed a conditional phase shift of […]
Tag Archives: Quantum vortices
A new chapter in quantum vortices: Customizing electron vortex beams
Nanowerk April 23, 2024 Almost all the experimentally created electron vortex beam (EVBs) manifest isotropic doughnut intensity patterns. Based on the correlation between local divergence angle of electron beam and phase gradient along azimuthal direction, researchers in China showed that free electrons could be tailored to EVBs with customizable intensity patterns independent of the carried OAM. As proof-of-concept, by using computer generated hologram and designing phase masks to shape the incident free electrons they tailored three structured EVBs carrying identical OAM to exhibit completely different intensity patterns. Through the modal decomposition, they quantitatively investigated their OAM spectral distributions and revealed […]