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Dipartimento di Scienze Fisiche, Informatiche e Matematiche sede ex-Fisica

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2022 - Challenging Point Scanning across Electron Microscopy and Optical Imaging using Computational Imaging [Articolo su rivista]
Kallepalli, Akhil; Viani, Lorenzo; Stellinga, Daan; Rotunno, Enzo; Bowman, Richard; Gibson, Graham M.; Sun, Ming-Jie; Rosi, Paolo; Frabboni, Stefano; Balboni, Roberto; Migliori, Andrea; Grillo, Vincenzo; Padgett, Miles J.

2022 - Enhancing Electron Computational Ghost Imaging Using Artificial Neural Networks [Articolo su rivista]
Viani, Lorenzo; Rosi, Paolo; Rotunno, Enzo; Frabboni, Stefano; Balboni, Roberto; Grillo, Vincenzo

2021 - Convolutional neural network as a tool for automatic alignment of electron optical beam shaping devices [Articolo su rivista]
Rotunno, Enzo; Tavabi, Amir; Rosi, Paolo; Frabboni, Stefano; Tiemeijer, Peter; Dunin-Borkovski, Rafal; Grillo, Vincenzo

2021 - Experimental Demonstration of an Electrostatic Orbital Angular Momentum Sorter for Electron Beams [Articolo su rivista]
Tavabi, Amir H.; Rosi, Paolo; Rotunno, Enzo; Roncaglia, Alberto; Belsito, Luca; Frabboni, Stefano; Pozzi, Giulio; Gazzadi, Gian Carlo; Lu, Peng-Han; Nijland, Robert; Ghosh, Moumita; Tiemeijer, Peter; Karimi, Ebrahim; Dunin-Borkowski, Rafal E.; Grillo, Vincenzo

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. is realized in tests on controlled electron vortex beams, with the perspective of reaching an optimal OAM resolution of 1. in the near future.

2020 - Combination of Electron Energy-loss Spectroscopy and Orbital Angular Momentum Spectroscopy. Applications to Electron Magnetic Chiral Dichroism, Plasmon-loss, and Core-loss [Articolo su rivista]
Bertoni, G.; Rotunno, E.; Tavabi, A.; Zanfrognini, M.; Rosi, P.; Frabboni, S.; Karimi, E.; Dunin-Borkowski, R.; Grillo, V.

2020 - Design, Realization and Challenges of an Orbital Angular Momentum Sorter: A New Instrument for Phase Microscopy [Articolo su rivista]
Tavabi, Amir; Rosi, Paolo; Pozzi, Giulio; Roncaglia, Alberto; Frabboni, Stefano; Rotunno, Enzo; Lu, Peng Han; Nijland, Robert; Tiemeijer, Peter; Ghosh, Moumita; Karimi, Ebrahim; Dunin-Borkowski, Rafal; Grillo, Vincenzo

2020 - Near-4D STEM with an Orbital Angular Momentum Sorter: Advantages and Challenges [Articolo su rivista]
Rotunno, Enzo; Tavabi, Amir; Rosi, Paolo; Roncaglia, Alberto; Nijland, Robert; Ghosh, Moumita; Tiemeijer, Peter; Frabboni, Stefano; Dunin-Borkowski, Rafal; Grillo, Vincenzo