Influence of the photon orbital angular momentum on electric dipole transitions: negative experimental evidence

Giammanco, F.; Perona, A.; Marsili, Paolo; Conti, F.; Fidecaro, F.; Gozzini, S.; Lucchesini, A.

doi:10.1364/ol.42.000219

Cited by 29 publications

(22 citation statements)

References 38 publications

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“…For the simplest process, single-photon absorption, this conclusion has indeed borne out by recent experimental evidence [111]. For higher order processes involving more than single-photon events, studied under conditions that invalidate the paraxial approximation-including a near-field configuration or in the vicinity of a beam focus-the presence of longitudinal fields [65] and any additional Gouy phase [112] admit an additional dependence on l, not exhibited in the present simplified analysis.…”

Section: Transitions and Motionssupporting

confidence: 66%

Quantum formulation for nanoscale optical and material chirality: symmetry issues, space and time parity, and observables

Andrews

2018

J. Opt.

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To properly represent the interplay and coupling of optical and material chirality at the photonmolecule or photon-nanoparticle level invites a recognition of quantum facets in the fundamental aspects and mechanisms of light-matter interaction. It is therefore appropriate to cast theory in a general quantum form, one that is applicable to both linear and nonlinear optics as well as various forms of chiroptical interaction including chiral optomechanics. Such a framework, fully accounting for both radiation and matter in quantum terms, facilitates the scrutiny and identification of key issues concerning spatial and temporal parity, scale, dissipation and measurement. Furthermore it fully provides for describing the interactions of structured or twisted light beams with a vortex character, and it leads to the complete identification of symmetry conditions for materials to provide for chiral discrimination. Quantum considerations also lend a distinctive perspective to the very different senses in which other aspects of chirality are recognized in metamaterials. Duly attending to the symmetry principles governing allowed or disallowed forms of chiral discrimination supports an objective appraisal of the experimental possibilities and developing applications.

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Section: Transitions and Motionssupporting

confidence: 66%

Quantum formulation for nanoscale optical and material chirality: symmetry issues, space and time parity, and observables

Andrews

2018

J. Opt.

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“…Comparing the results of the iron dichroism experiment with the well known XMCD spectra of iron suggests that there is a similar transfer of orbital angular momentum between the beam electron and the internal atomic states, in contrast to the case of optical vortices, in which no orbital angular momentum transfer can arise in dipole transition (Andrews et al, 2004;Babiker et al, 2002;Jáuregui, 2004) (see also (Alexandrescu et al, 2005)) nor any were observed (Araoka et al, 2005;Giammanco et al, 2017;Lö✏er et al, 2011). The mechanisms of the atomic-vortex interactions are quite di↵erent in the optics and electron cases -in the optics case the interaction Hamiltonian arising from the minimal coupling prescrip-tion does not exhibit the required chirality to mediate orbital angular momentum transfer, in contrast to the long-range Coulomb interaction between the atomic and vortex electrons (Lloyd et al, 2012a,c).…”

Section: Interaction With Mattermentioning

confidence: 83%

Electron vortices: Beams with orbital angular momentum

et al. 2017

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The recent prediction and subsequent creation of electron vortex beams in a number of laboratories occurred after almost 20 years had elapsed since the recognition of the physical significance and potential for applications of the orbital angular momentum carried by optical vortex beams. A rapid growth in interest in electron vortex beams followed, with swift theoretical and experimental developments. Much of the rapid progress can be attributed in part to the clear similarities between electron optics and photonics arising from the functional equivalence between the Helmholtz equations governing the free space propagation of optical beams and the time-independent Schrödinger equation governing freely propagating electron vortex beams. There are, however, key di↵erences in the properties of the two kinds of vortex beams. This review is concerned primarily with the electron type, with specific emphasis on the distinguishing vortex features: notably the spin, electric charge, current and magnetic moment, the spatial distribution as well as the associated electric and magnetic fields. The physical consequences and potential applications of such properties are pointed out and analysed, including nanoparticle manipulation and the mechanisms of orbital angular momentum transfer in the electron vortex interaction with matter.

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“…The first attempt at tackling this question utilized QED methods and determined that, for dipole transitions, the OAM of light is transferred to the mechanical motion of particles only; the lowest-order interaction required for OAM to be transferred to an electron is through E2 transitions [218]. While certain other non-QED analyses argued for OAM transferral in the dipole approximation, this failed to be observed in experiments [219,220]. Very recently, the QED theory was experimentally vindicated in the observation of modified selection rules for absorption of OAM light in which two units of angular momentum, 2 , were transferred to the valence electron of a 40 Ca + ion through an E2 transition-one quantum of angular momentum from the spin angular momentum, and one from the OAM [221].…”

Section: B Original Predictions Of Qedmentioning

confidence: 99%

Quantum electrodynamics in modern optics and photonics: tutorial

et al. 2020

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One of the key frameworks for developing the theory of light-matter interactions in modern optics and photonics is quantum electrodynamics (QED). Contrasting with semiclassical theory, which depicts electromagnetic radiation as a classical wave, QED representations of quantized light fully embrace the concept of the photon. This tutorial review is a broad guide to cutting-edge applications of QED, providing an outline of its underlying foundation and an examination of its role in photon science. Alongside the full quantum methods, it is shown how significant distinctions can be drawn when compared to semiclassical approaches. Clear advantages in outcome arise in the predictive capacity and physical insights afforded by QED methods, which favors its adoption over other formulations of radiation-matter interaction.

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Influence of the photon orbital angular momentum on electric dipole transitions: negative experimental evidence

Cited by 29 publications

References 38 publications

Quantum formulation for nanoscale optical and material chirality: symmetry issues, space and time parity, and observables

Quantum formulation for nanoscale optical and material chirality: symmetry issues, space and time parity, and observables

Electron vortices: Beams with orbital angular momentum

Quantum electrodynamics in modern optics and photonics: tutorial

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