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• W1972643286 abstract "The diffraction of electrons through a nanoscale hologram that imprints a certain phase modulation on the electrons’ wavefunction produces a non-spreading electron Airy beam that follows a parabolic trajectory and can reconstruct its original shape after passing an obstacle. Light, as is widely known, travels in straight lines. Yet a few years ago it was shown that specially tailored light beams can follow a curved trajectory, without spreading. Such beams follow a waveform known from quantum mechanics, called the Airy function, a concept originally developed by the astronomer Sir George Biddell Airy in work on the trajectories of light in rainbows. Now, with the demonstration of Airy beams consisting of free electrons, new possibilities for manipulating electrons are in prospect. Airy electron beam arcs were generated by the diffraction of electrons through a nanoscale hologram, which imprints a specific phase modulation on the electrons' wavefunction. These beams can bend in space without any external force, stay localized over distances of up to 100 metres and self-heal after passing an obstacle. Possible applications include use in high-performance electron microscopes and as a basis for a new type of electron interferometer. Within the framework of quantum mechanics, a unique particle wave packet exists1 in the form of the Airy function2,3. Its counterintuitive properties are revealed as it propagates in time or space: the quantum probability wave packet preserves its shape despite dispersion or diffraction and propagates along a parabolic caustic trajectory, even though no force is applied. This does not contradict Newton’s laws of motion, because the wave packet centroid propagates along a straight line. Nearly 30 years later, this wave packet, known as an accelerating Airy beam, was realized4 in the optical domain; later it was generalized to an orthogonal and complete family of beams5 that propagate along parabolic trajectories, as well as to beams that propagate along arbitrary convex trajectories6. Here we report the experimental generation and observation of the Airy beams of free electrons. These electron Airy beams were generated by diffraction of electrons through a nanoscale hologram7,8,9, which imprinted on the electrons’ wavefunction a cubic phase modulation in the transverse plane. The highest-intensity lobes of the generated beams indeed followed parabolic trajectories. We directly observed a non-spreading electron wavefunction that self-heals10, restoring its original shape after passing an obstacle. This holographic generation of electron Airy beams opens up new avenues for steering electronic wave packets like their photonic counterparts, because the wave packets can be imprinted with arbitrary shapes5 or trajectories6." @default.
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• W1972643286 date "2013-02-01" @default.
• W1972643286 modified "2023-10-16" @default.
• W1972643286 title "Generation of electron Airy beams" @default.
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• W1972643286 doi "https://doi.org/10.1038/nature11840" @default.
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