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

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 sci-entific 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 loc-al 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 elec-tron microscope,three structured EVBs carrying identical OAM are tailored to exhibit completely different intensity pat-terns.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 geo-metries.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.

electron vortex beamorbital angular momentumdiffraction holography

Pengcheng Huo、Ruixuan Yu、Mingze Liu、Hui Zhang、Yan-qing Lu、Ting Xu

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National Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

College of Engineering and Applied Sciences,Key Laboratory of Intelligent Optical Sensing and Manipulation and Jiangsu Key Laboratory of Artificial Functional Materials,Nanjing University,Nanjing 210093,China

Key Research and Development Program from Ministry of Science and Technology of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu ProvinceNatural Science Foundation of Jiangsu ProvinceFundamental Research Funds for Central Universities

2022YFA12050001227421762105142BK20220068BK20212004

2024

10.29026/oea.2024.230184

光电进展(英文版)

光电进展(英文版)

EI
ISSN：
年,卷(期)：2024.7(2)
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