Huo PC, Yu RX, Liu MZ et al. Tailoring electron vortex beams with customizable intensity patterns by electron diffraction holography. Opto-Electron Adv 7, 230184 (2024). doi: 10.29026/oea.2024.230184
Citation: Huo PC, Yu RX, Liu MZ et al. Tailoring electron vortex beams with customizable intensity patterns by electron diffraction holography. Opto-Electron Adv 7, 230184 (2024). doi: 10.29026/oea.2024.230184

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Tailoring electron vortex beams with customizable intensity patterns by electron diffraction holography

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  • An electron vortex beam (EVB) carrying orbital angular momentum (OAM) plays a key role in a series of fundamental scientific researches, such as chiral energy-loss spectroscopy and magnetic dichroism spectroscopy. So far, almost all the experimentally created EVBs manifest isotropic doughnut intensity patterns. Here, based on the correlation between local divergence angle of electron beam and phase gradient along azimuthal direction, we show that free electrons can be tailored to EVBs with customizable intensity patterns independent of the carried OAM. As proof-of-concept, by using computer generated hologram and designing phase masks to shape the incident free electrons in the transmission electron microscope, three structured EVBs carrying identical OAM are tailored to exhibit completely different intensity patterns. Furthermore, through the modal decomposition, we quantitatively investigate their OAM spectral distributions and reveal that structured EVBs present a superposition of a series of different eigenstates induced by the locally varied geometries. These results not only generalize the concept of EVB, but also demonstrate an extra highly controllable degree of freedom for electron beam manipulation in addition to OAM.
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