Experimental Verification of Position-Dependent Angular-Momentum Selection Rules for Absorption of Twisted Light by a Bound Electron

Abstract

We analyze the multipole excitation of atoms with twisted light, i.e., by a vortex light field that carries orbital angular momentum. A single trapped ${}^{40}$Ca${}^{+}$ ion serves as a localized and positioned probe of the exciting field. We drive the $S_{1/2}\to D_{5/2}$ transition and observe the relative strengths of different transitions, depending on the ion's transversal position with respect to the center of the vortex light field. On the other hand, transition amplitudes are calculated for a twisted light field in form of a Bessel beam, a Bessel-Gauss and a Gauss-Laguerre mode. Analyzing experimental obtained transition amplitudes we find agreement with the theoretical predictions at a level of better than 3\%. Finally, we propose measurement schemes with two-ion crystals to enhance the sensing accuracy of vortex modes in future experiments.

18 pages, 10 figures

References in corpus (7)

• Hypergeometric-Gaussian Modes
• Entanglement-based dc magnetometry with separated ions
• Multipole (E1, M1, E2, M2, E3, M3) transition wavelengths and rates between 3l5l' excited and ground states in nickel-like ions
• The role of beam waist in Laguerre-Gauss expansion of vortex beam
• High-Multipole Excitations of Hydrogen-Like Atoms by Twisted Photons near Phase Singularity
• Circular Dichroism of Twisted Photons in the Non-Chiral Atomic Matter
• Excitation of high orbital angular momentum Rydberg states with Laguerre-Gauss beams

Cited by in corpus (40)

• Promises and challenges of high-energy vortex states collisions
• Hard X-ray helical dichroism of disordered molecular media
• Orbital angular momentum of optical, acoustic, and quantum-mechanical spatiotemporal vortex pulses
• Atomic, molecular and optical physics applications of longitudinally coherent and narrow bandwidth Free-Electron Lasers
• Radiative Capture of Cold Neutrons by Protons and Deuteron Photodisintegration with Twisted Beams
• Excitation of E1-forbidden Atomic Transitions with Electric, Magnetic or Mixed Multipolarity in Light Fields Carrying Orbital and Spin Angular Momentum
• Generalized excitation of atomic multipole transitions by twisted light modes
• Dynamical control of nuclear isomer depletion via electron vortex beams
• Selection rules for structured light in nanooligomers and other nanosystems
• Atomic Spectroscopy with Twisted Photons: Separation of M1--E2 Mixed Multipoles
• Recoil Momentum Effects in Quantum Processes Induced by Twisted Photons
• Modification of multipole transitions by twisted light
• Trapped atoms in spatially-structured vector light fields
• Resonant scattering of plane-wave and twisted photons at the Gamma Factory
• The interaction of twisted Laguerre-Gaussian light with a GaAs photocathode to investigate photogenerated polarized electrons
• Delta baryon photoproduction with twisted photons
• Electrons in intense laser fields with local phase, polarization, and skyrmionic textures
• Resonant sequential two-photon ionization of atoms by twisted and plane-wave light
• Observability of the superkick effect within a quantum-field-theoretical approach
• Interseries transitions between Rydberg excitons in Cu${}_2$O
• Polarization Transfer from the Twisted Light to an Atom
• Superkicks and the photon angular and linear momentum density
• Optical flux pump in the quantum Hall regime
• Photoexcitation of atoms by cylindrically polarized Laguerre-Gaussian beams
• Probing spin dynamics of 2D excitons with twisted light
• Spin Polarization of Photoelectrons in GaAs Excited by Twisted Photons
• Double-twisted spectroscopy with delocalized atoms
• Quadrupole Interaction of Non-diffracting Beams with Two-Level Atoms
• Twisted light-induced spin-spin interaction in a chiral helimagnet
• Orbital angular momentum beam generation using a free-electron laser oscillator
• Electromagnetic Vortex Topologies from Sparse Circular Phased Arrays
• Quadrupole absorption rate for atoms in circularly-polarized optical vortices
• Theoretical consideration of a twisted atom
• Direction-dependent coupling between a nanofiber-guided light field and a two-level atom with an electric quadrupole transition
• Absorption of hybrid fibre modes by Cs atoms in quadrupole transitions
• Unified treatment of the total angular momentum of single photons via generalized quantum observables
• High Harmonic Generation with Orbital Angular Momentum Beams: Beyond-dipole Corrections
• Optical angular momentum in atomic transitions: a paradox
• Conversion of twistedness from light to atoms
• Photoelectron emission via time and phase-tailored electromagnetic fields