Acceleration of electrons by a Bessel-Gaussian beam in vacuum

Zhao, Zhiguo; Lü, Baida

doi:10.1007/s11082-008-9249-y

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…In such setup, the full width of the gain peak must correspond to electrons that have absorbed one photon out of the external light, and therefore the energy resolution of this technique is only limited by the width of the external illumination, typically in the sub-meV domain (Rapoport and Khattak, 1988). This is a 100-fold 22 In-vacuum optical acceleration of an electron moving along the axis of a Bessel beam has been recently proposed (Zhao and Lü, 2008). The electron energy-gain probability for light of frequency ω is proportional to the area of the energy-gain peak.…”

Section: Electron Energy-gain Spectroscopymentioning

confidence: 99%

Optical excitations in electron microscopy

2010

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This review discusses how low-energy valence excitations created by swift electrons can render information on the optical response of structured materials with unmatched spatial resolution. Electron microscopes are capable of focusing electron beams on subnanometer spots and probing the target response either by analyzing electron energy losses or by detecting emitted radiation. Theoretical frameworks suited to calculate the probability of energy loss and light emission ͑cathodoluminescence͒ are reconsidered and compared with experimental results. More precisely, a quantum-mechanical description of the interaction between the electrons and the sample is discussed, followed by a powerful classical dielectric approach that can be applied in practice to more complex systems. The conditions are assessed under which classical and quantum-mechanical formulations are equivalent. The excitation of collective modes such as plasmons is studied in bulk materials, planar surfaces, and nanoparticles. Light emission induced by the electrons is shown to constitute an excellent probe of plasmons, combining subnanometer resolution in the position of the electron beam with nanometer resolution in the emitted wavelength. Both electron energy-loss and cathodoluminescence spectroscopies performed in a scanning mode of operation yield snapshots of plasmon modes in nanostructures with fine spatial detail as compared to other existing imaging techniques, thus providing an ideal tool for nanophotonics studies.

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Section: Electron Energy-gain Spectroscopymentioning

confidence: 99%

Optical excitations in electron microscopy

2010

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“…Casperson and Tovar [22,23] introduced the paraxial solution of these beams. Many sophisticated laser beams have already been used to examine electron acceleration, including HG beams [24], Laguerre-Gaussian beams [25,26], and Bessel-Gaussian beams [27]. Cosh-Gaussian laser beams (CGLBs) have been found to have more power and the capacity to focus earlier than well-known Gaussian beams [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Efficient electron acceleration by using Hermite-cosh-Gaussian laser beam in vacuum

Pramanik¹,

Ghotra²,

Kant³

et al. 2022

Laser Phys. Lett.

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The electron acceleration in vacuum has been studied theoretically using a radially polarized (RP) Hermite-cosh-Gaussian (HChG) laser beam. Even if the laser’s power is low, the RP HChG laser beam is quite effective and responsible for producing high energy electron. Due to the beauty (earlier focus) of such a laser beam, it is significantly better suited to acquiring GeV order energy over short periods of time than other laser beams. The electron acceleration process is strongly influenced by two more adjustable parameters associated with this beam: decentered parameter (b) and Hermite order (s). Throughout this investigation, better trapping phenomena have been identified. The effects of changing the intensity parameter ( a 0 ), the beam waist width ( r 0 ′ ), the decentered parameter (b), and the order of the Hermite function on electron energy gain have been investigated.

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“…Many complex laser-beam profiles, such as complex Hermite-Gaussian beams [15], Laguerre-Gaussian beams [16,17] and Bessel-Gaussian beams [18] have been used for electron acceleration.…”

Section: Introductionmentioning

confidence: 99%

Electron Acceleration by a radially polarised cosh-Gaussian laser beam in vacuum

Singh¹,

Rajput²,

Ghotra³

et al. 2021

Commun. Theor. Phys.

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In this paper, a radially polarised cosh-Gaussian laser beam (CGLB) is used to study the electron acceleration produced in vacuum. A highly energetic electron beam can be achieved by a CGLB, even with comparatively low-powered lasers. The properties of a CGLB cause it to focus earlier, over a shorter duration than a Gaussian laser beam, which makes it suitable for obtaining high energies over small durations. It is found that the energy gained by the electrons strongly depends upon the decentering parameter of the laser profile. It is also observed that for a fixed value of energy gain, if the decentering parameter is increased, then the intensity of the laser field decreases. The dependence of the energy gained by electrons on the laser intensity and the laser-spot size is also studied.

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Acceleration of electrons by a Bessel-Gaussian beam in vacuum

Cited by 11 publications

References 20 publications

Optical excitations in electron microscopy

Optical excitations in electron microscopy

Efficient electron acceleration by using Hermite-cosh-Gaussian laser beam in vacuum

Electron Acceleration by a radially polarised cosh-Gaussian laser beam in vacuum

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