Electron-light interactions beyond the adiabatic approximation: recoil engineering and spectral interferometry

Talebi, Nahid

doi:10.1080/23746149.2018.1499438

Cited by 36 publications

(35 citation statements)

References 155 publications

(299 reference statements)

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“…session at the workshop Electron Beam Spectroscopy for Nanophotonics (EBSN) held in Sitges, Spain, during October [25][26][27]2017. We thank the workshop participants for providing their insights; in particular the discussion panelists Joanne Etheridge, Ido Kaminer, Claus Ropers, and Johan Verbeeck.…”

Section: Discussionmentioning

confidence: 99%

Electron-beam spectroscopy for nanophotonics

2019

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Progress in electron-beam spectroscopies has recently enabled the study of optical excitations with combined space, energy and time resolution in the nanometer, millielectronvolt and femtosecond domain, thus providing unique access into nanophotonic structures and their detailed optical responses. These techniques rely on ∼1-300 keV electron beams focused at the sample down to subnanometer spots, temporally compressed in wavepackets a few femtoseconds long, and in some cases controlled by ultrafast light pulses. The electrons undergo energy losses and gains, also giving rise to cathodoluminescence light emission, which are recorded to reveal the optical landscape along the beam path. This review portraits these advances, with a focus on coherent excitations, emphasizing the increasing level of control over the electron wave functions and ensuing applications in the study and technological use of optically resonant modes and polaritons in nanoparticles, 2D materials and engineered nanostructures.

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Section: Discussionmentioning

confidence: 99%

Electron-beam spectroscopy for nanophotonics

2019

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“…For calculating the optical Gaussian beams, we have used the analytical solutions based on the paraxial approximations, which perfectly model the laser excitations, and is valid for focus regions larger than l 1.5 , where l is the optical wavelength. Here the waist of the introduced optical beams are l 2 .We however have benchmarked this approximation by comparing our results with those obtained using a self-consistent Maxwell-Schrödinger numerical toolbox, and the same diffraction orders and probability amplitudes have been noticed [38].…”

Section: Methodsmentioning

confidence: 82%

Interference between quantum paths in coherent Kapitza–Dirac effect

Talebi

Lienau

2019

New J. Phys.

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In the Kapitza-Dirac effect, atoms, molecules, or swift electrons are diffracted off a standing wave grating of the light intensity created by two counter-propagating laser fields. In ultrafast electron optics, such a coherent beam splitter offers interesting perspectives for ultrafast beam shaping. Here, we study, both analytically and numerically, the effect of the inclination angle between two laser fields on the diffraction of pulsed, low-energy electron beams. For sufficiently high light intensities, we observe a rich variety of complex diffraction patterns. These do not only reflect interferences between electrons scattered off intensity gratings that are formed by different vector components of the laser field. They may also result, for certain light intensities and electron velocities, from interferences between these ponderomotive scattering and direct light absorption and stimulated emission processes, usually forbidden for far-field light. Our findings may open up perspectives for the coherent manipulation and control of ultrafast electron beams by free-space light.achieved by a generalization of the Kapitza-Dirac (KD) effect [20][21][22] to the concomitant utilization of standingwave and traveling-wave light patterns. In the normal KD effect, electron waves, traveling through a standingwave pattern of light, are diffracted to transversely populated momentum states at multiples of twice the momentum of free space light. We show that the KD effect can be generalized to the realization of arbitrary momentum states of the electron wavepacket by controlling the interference between quantum pathways originating from distinctly different parts, absorptive/emissive and ponderomotive, of the interaction Hamiltonian. This offers fundamentally new degrees of freedom for designing light-controlled phase masks for free-space electron pulses. r t lk ok r J J J J P J e E k x J J J J

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“…Therefore, the propagation of the electron is governed by its relativistic initial velocity and direction, as well as electromagnetic forces inserted on it. Nevertheless, we notice that the latter forces enforce negligible changes of the electron trajectory, as such the so-called non-recoil approximation is still valid 57,58 . The dispersion diagram of the ridge waveguide of Bi 2 Se 3 was computed by using the finite-difference frequency-domain method 59 .…”

Section: Methodsmentioning

confidence: 93%

Interaction of edge exciton polaritons with engineered defects in the hyperbolic material Bi2Se3

et al. 2021

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Hyperbolic materials exhibit unique properties that enable intriguing applications in nanophotonics. The topological insulator Bi2Se3 represents a natural hyperbolic optical medium, both in the THz and visible range. Here, using cathodoluminescence spectroscopy and electron energy-loss spectroscopy, we demonstrate that Bi2Se3 supports room-temperature exciton polaritons and explore the behavior of hyperbolic edge exciton polaritons, which are hybrid modes resulting from the coupling of the polaritons bound to the upper and lower edges of Bi2Se3 nanoplatelets. We compare Fabry-Pérot-like resonances emerging in edge polariton propagation along pristine and artificially structured edges and experimentally demonstrate the possibility to steer edge polaritons by means of grooves and nanocavities. The observed scattering of edge polaritons by defect structures is found to be in good agreement with finite-difference time-domain simulations. Our findings reveal the extraordinary capability of hyperbolic polariton propagation to cope with the presence of defects, providing an excellent basis for applications such as nanooptical circuitry, nanoscale cloaking and nanoscopic quantum technology.

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Electron-light interactions beyond the adiabatic approximation: recoil engineering and spectral interferometry

Cited by 36 publications

References 155 publications

Electron-beam spectroscopy for nanophotonics

Electron-beam spectroscopy for nanophotonics

Interference between quantum paths in coherent Kapitza–Dirac effect

Interaction of edge exciton polaritons with engineered defects in the hyperbolic material Bi2Se3

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