Experimental Demonstration of an Electrostatic Orbital Angular Momentum Sorter for Electron Beams
Amir H. Tavabi,Paolo Rosi,Enzo Rotunno,Alberto Roncaglia,Luca Belsito,Stefano Frabboni,Giulio Pozzi,Giulio Pozzi,Gian Carlo Gazzadi,Peng-Han Lu,Peng-Han Lu,Robert Nijland,Moumita Ghosh,Peter Tiemeijer,Ebrahim Karimi,Rafal E. Dunin-Borkowski,Vincenzo Grillo +16 more
TLDR
In this paper, an electrostatic sorter was used to analyze the orbital angular momentum (OAM) states of electron beams in a transmission electron microscope, achieving an OAM resolution of 50 nm.Abstract:
The component of orbital angular momentum (OAM) in the propagation direction is one of the fundamental quantities of an electron wave function that describes its rotational symmetry and spatial chirality. Here, we demonstrate experimentally an electrostatic sorter that can be used to analyze the OAM states of electron beams in a transmission electron microscope. The device achieves postselection or sorting of OAM states after electron-material interactions, thereby allowing the study of new material properties such as the magnetic states of atoms. The required electron-optical configuration is achieved by using microelectromechanical systems technology and focused ion beam milling to control the electron phase electrostatically with a lateral resolution of 50 nm. An OAM resolution of $1.5\ensuremath{\hbar}$ is realized in tests on controlled electron vortex beams, with the perspective of reaching an optimal OAM resolution of $1\ensuremath{\hbar}$ in the near future.read more
Citations
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Vortex beams of atoms and molecules.
Alon Luski,Yair Segev,Rea David,Ora Bitton,Hila Nadler,A. Ronny Barnea,Alexey Gorlach,Ori Cheshnovsky,Ido Kaminer,Edvardas Narevicius +9 more
TL;DR: In this article, the authors discuss the role of angular momentum in quantum mechanics, recurring in every length scale from the microscopic interactions of light and matter to the macroscopic behavior of superfluids.
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A general framework for conformal transformations in electron optics
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Alignment of electron optical beam shaping elements using a convolutional neural network
Enzo Rotunno,Amir H. Tavabi,Paolo Rosi,Stefano Frabboni,Peter Tiemeijer,Rafal E. Dunin-Borkowski,Vincenzo Grillo +6 more
TL;DR: A convolutional neural network is used to align an orbital angular momentum sorter in a transmission electron microscope and offers the possibility of real-time tuning of other electron optical devices and electron beam shaping configurations.
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Transverse Electron-Beam Shaping with Light
Marius Constantin Chirita Mihaila,Philipp Weber,M. Schneller,Lucas Grandits,Stefan Nimmrichter,Thomas Juffmann +5 more
TL;DR: In this article , a programmable transverse electron-beam shaping in free space based on ponderomotive potentials from short intense laser pulses is presented, which can realize both convex and concave electron lenses with a focal length of a few millimeters, comparable to those in state-of-theart electron microscopes.
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Ultrafast Transverse Modulation of Free Electrons by Interaction with Shaped Optical Fields
I. Madan,Veronica Leccese,Adam Mazur,Francesco Barantani,Thomas LaGrange,A. A. Sapozhnik,Phoebe Tengdin,Simone Gargiulo,Enzo Rotunno,J.-C. Olaya,Ido Kaminer,Vincenzo Grillo,F. Javier García de Abajo,Fabrizio Barone,Giovanni Maria Vanacore +14 more
TL;DR: In this paper , a transverse modulation of electron beams without complicated electron-optics elements or material nanostructures, but rather using shaped light beams, is demonstrated, which dramatically widens the range of patterns that can be imprinted on the electron profile and greatly facilitates tailored electronbeam shaping.
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