97 citations · 412 across the 22 of their papers we have counts for
22 papers
Quantum tomography of inelastic electron scattering \emph{via} orbital angular momentum states
Amir H. Tavabi, Alessio D'Errico, Paolo Rosi +10
The physical properties of a quantum system, whether pure or mixed, are described fully by its density matrix. Recovery of the density matrix through projective measurements -- ref…
Designing electrostatic MEMS-based electron optics: the case of the spiral phase plate
Payam Habibdazeh Kavkani, Amir H. Tavabi, Paolo Rosi +8
A new generation of microfabricated MEMS for electron optics is changing electron microscopy for the better. These devices allow operations on the electron beam that are impossible…
Computational ghost imaging for transmission electron microscopy
Akhil Kallepalli, Lorenzo Viani, Daan Stellinga +9
While transmission electron microscopes (TEM) can achieve a much higher resolution than optical microscopes, they face challenges of damage to samples during the high energy proces…
Automatic alignment of an orbital angular momentum sorter in a transmission electron microscope using a convolution neural network
P. Rosi, A. Clausen, D. Weber +6
We report on the automatic alignment of a transmission electron microscope equipped with an orbital angular momentum sorter using a convolutional neural network. The neural network…
Theoretical and practical aspects of the design and production of synthetic holograms for transmission electron microscopy
Paolo Rosi, Federico Venturi, Giacomo Medici +10
Beam shaping - the ability to engineer the phase and the amplitude of massive and massless particles - has long interested scientists working on communication, imaging and the foun…
Alignment of electron optical beam shaping elements using a convolutional neural network
E. Rotunno, A. H. Tavabi, P. Rosi +4
A convolutional neural network is used to align an orbital angular momentum sorter in a transmission electron microscope. The method is demonstrated using simulations and experimen…
Focused Ion Beam fabrication of Janus bimetallic cylinders acting as drift~tube Zernike phase plates
Paolo Rosi, Gian Carlo Gazzadi, Stefano Frabboni +4
Modern nanotechnology techniques offer new opportunities for fabricating structures and devices at the micron and sub-micron level. Here, we use focused ion beam techniques to real…
Efficient molecule discrimination in electron microcopy through an optimized orbital angular momentum sorter
Filippo Troiani, Enzo Rotunno, Stefano Frabboni +4
We consider the problem of discriminating macromolecular structures in an electron microscope, through a specific beam shaping technique. Our approach is based on maximizing the wh…
Sum rules in zone axis STEM-orbital angular momentum resolved electron magnetic chiral dichroism
Matteo Zanfrognini, Enzo Rotunno, Jan Rusz +4
In this work we derive sum rules for orbital angular momentum(OAM) resolved electron magnetic chiral dichroism (EMCD) which enable the evaluation of the strength of spin and orbita…
Experimental demonstration of an electrostatic orbital angular momentum sorter for electrons
Amir H. Tavabi, Paolo Rosi, Giulio Pozzi +9
We report the first experimental demonstration of an electrostatic electron orbital angular momentum (OAM) sorter, which can be used to analyze the OAM states of electrons in a tra…
Orbital-angular-momentum-resolved electron magnetic chiral dichroism
Enzo Rotunno, Matteo Zanfrognini, Stefano Frabboni +4
We propose a highly efficient atomically-resolved mode of electron magnetic chiral dichroism. This method exploits the recently introduced orbital angular momentum spectrometer to…
Orbital angular momentum and energy loss characterization of plasmonic excitations in metallic nanostructures in TEM
Matteo Zanfrognini, Enzo Rotunno, Stefano Frabboni +4
Recently, a new device to measure the Orbital Angular Momentum (OAM) electronic spectrum after elastic/inelastic scattering in a transmission electron microscope has been introduce…
Electron beam shaping: how to control the e-beam propagation along atomic columns
E. Rotunno, A. Tavabi, E. Yucelen +5
In this work we report on a detailed analysis of the propagation of high energy electron beams having different shapes in a model system, namely [100] oriented zincblende GaN cryst…
Towards a holographic approach to spherical aberration correction in scanning transmission electron microscopy
Vincenzo Grillo, Amir H. Tavabi, Emrah Yucelen +11
Recent progress in phase modulation using nanofabricated electron holograms has demonstrated how the phase of an electron beam can be controlled. In this paper, we apply this conce…
Phase retrieval of an electron vortex beam using diffraction holography
Federico Venturi, Marco Campanini, Gian Carlo Gazzadi +6
In both light optics and electron optics, the amplitude of a wave scattered by an object is an observable that is usually recorded in the form of an intensity distribution in a rea…
Nondestructive Measurement of Orbital Angular Momentum for an Electron Beam
Hugo Larocque, Frédéric Bouchard, Vincenzo Grillo +6
Free electrons with a helical phase front, referred to as "twisted" electrons, possess an orbital angular momentum (OAM) and, hence, a quantized magnetic dipole moment along their…
Realization of electron vortices with large orbital angular momentum using miniature holograms fabricated by electron beam lithography
E. Mafakheri, A. H. Tavabi, P. -H. Lu +9
Free electron beams that carry high values of orbital angular momentum (OAM) possess large magnetic moments along the propagation direction. This makes them an ideal probe for meas…
Measuring an electron beam's orbital angular momentum spectrum
incenzo Grillo, Amir H. Tavabi, Federico Venturi +12
Quantum complementarity states that particles, e.g. electrons, can exhibit wave-like properties such as diffraction and interference upon propagation. \textit{Electron waves} defin…
Generation and Application of Bessel Beams in Electron Microscopy
Vincenzo Grillo, Jérémie Harris, Gian Carlo Gazzadi +6
We report a systematic treatment of the holographic generation of electron Bessel beams, with a view to applications in electron microscopy. We describe in detail the theory underl…
Holographic generation of highly twisted electron beams
Vincenzo Grillo, Gian Carlo Gazzadi, Erfan Mafakheri +3
Free electrons can possess an intrinsic orbital angular momentum, similar to those in an electron cloud, upon free-space propagation. The wavefront corresponding to the electron's…
Convergent beam electron-diffraction investigation of lattice mismatch and static disorder in GaAs/GaAs1-xNx intercalated GaAs/GaAs1-xNx:H heterostructures
Stefano Frabboni, Vincenzo Grillo, Gian Carlo Gazzadi +8
Hydrogen incorporation in diluted nitride semiconductors dramatically modifies the electronic and structural properties of the crystal through the creation of nitrogen-hydrogen com…
Image charge screening: a new approach to enhance magnetic ordering temperatures
S. Altieri, M. Finazzi, H. H. Hsieh +8
We have tested the concept of image charge screening as a new approach to enhance magnetic ordering temperatures and superexchange interactions in ultra thin films. Using a 3 monol…