Promises and challenges of high-energy vortex states collisions

Ivanov, Igor P.

doi:10.48550/arxiv.2205.00412

Cited by 6 publications

(7 citation statements)

References 264 publications

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“…Structured wave functions of light, electrons, and atoms have become widely used scientific tools (6)(7)(8)(9)(10)(11)(12)(13). A general class of structured wave functions is indexed by orbital angular momentum (OAM) (14)(15)(16)(17)(18), in which the wave function varies as e i𝓁 , where 𝓁 is the OAM value and the angle  describes the azimuth around the propagation vector.…”

Section: Introductionmentioning

confidence: 99%

Experimental realization of neutron helical waves

et al. 2022

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Methods of preparation and analysis of structured waves of light, electrons, and atoms have been advancing rapidly. Despite the proven power of neutrons for material characterization and studies of fundamental physics, neutron science has not been able to fully integrate these techniques because of small transverse coherence lengths, the relatively poor resolution of spatial detectors, and low fluence rates. Here, we demonstrate methods that are practical with the existing technologies and show the experimental achievement of neutron helical wavefronts that carry well-defined orbital angular momentum values. We discuss possible applications and extensions to spin-orbit correlations and material characterization techniques.

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Section: Introductionmentioning

confidence: 99%

Experimental realization of neutron helical waves

et al. 2022

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“…2 of [25], and in Sect. 3 of [26], where the S-matrix for scattering of wave packets of a general form is given in terms of the plane-wave invariant amplitude M, have to be refined.…”

Section: Introductionmentioning

confidence: 99%

Coherent radiation of photons by particle wave packets

Kazinski

2022

Eur. Phys. J. C

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The radiation of photons by electrons is investigated in the framework of quantum electrodynamics up to the second order in the coupling constant e. The N-particle, coherent, and thermal initial states are considered and the forms of the electron wave packets are taken into account. The explicit expressions for the intensity of radiation and the inclusive probability to record a photon are obtained. It is found that there are three processes in this order of perturbation theory where the electron wave packet radiates coherently and can be regarded as a charged fluid even on integrating over the final states of the electron, i.e., in considering the inclusive probabilities and intensity of radiation. These processes are stimulated radiation by an electron, coherent radiation from a beam of particles, and reradiation of a photon in the Compton process. We obtain the explicit expressions for the intensity of radiation and the inclusive probability to record a photon for these processes. As particular cases, we consider: stimulated transition radiation produced by an electron wave packet traversing a mirror and backlighted by a laser wave, reradiation of photons in a coherent state by an electron wave packet. In the latter case, we deduce that the wave packet of a single electron can be endowed with the susceptibility tensor and this tensor has the same form as for an electron plasma in the small recoil limit.

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“…Twisted photons, which are the excitations of a quantum electromagnetic field with given projections of the total angular momentum different from their helicity, provide a promising tool for parallel signal coding in (quantum) telecommunication [1][2][3]. They can also be used in optical tweezers and in manipulating of rotational degrees of freedom of nano-particles, molecules, atoms, and nuclei [1,[4][5][6][7]. As for detection of twisted photons in the optical range, at the present moment there are elaborated techniques allowing one to decompose an almost arbitrary electromagnetic wave in terms of twisted photons even at a single photon level [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Scattering of plane-wave and twisted photons by helical media

Kazinski¹,

Korolev²

2022

J. Phys. A: Math. Theor.

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By using quantum electrodynamics in a dispersive medium, we describe scattering of plane-wave and twisted photons by a slab made of a helical medium, the helix axis being normal to the slab plane and the medium being not translation invariant in this plane, in general. In the particular cases, the permittivity tensor of a helical medium corresponds to cholesteric liquid crystals, C*-smectics, biaxial chiral nematics and smectics, q-plates, chiral sculptured thin ﬁlms, and helical dislocations. Both perturbative and nonperturbative approaches are considered. The explicit expressions for scattering amplitudes, probabilities, and Stokes parameters of photons are found taking into account the form of the photon wave packet. The selection rules are established showing that the helical medium transfers the momentum and the angular momentum to scattered photons. This property can be employed for production of twisted photons with large projection of the total angular momentum. We describe the device for shifting the projection of the total angular momentum of a photon and the principal scheme for signal coding in terms of twisted photons.

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Promises and challenges of high-energy vortex states collisions

Cited by 6 publications

References 264 publications

Experimental realization of neutron helical waves

Experimental realization of neutron helical waves

Coherent radiation of photons by particle wave packets

Scattering of plane-wave and twisted photons by helical media

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