A5028312956- Advanced Electron Microscopy Techniques and Applications
- Orbital Angular Momentum in Optics
- Near-Field Optical Microscopy
- Electron and X-Ray Spectroscopy Techniques
- Random lasers and scattering media
- Digital Holography and Microscopy
- Electrohydrodynamics and Fluid Dynamics
- Optical Polarization and Ellipsometry
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Chemometric Analyses
- Magnetic properties of thin films
- Advanced Fluorescence Microscopy Techniques
- Electrowetting and Microfluidic Technologies
- Characterization and Applications of Magnetic Nanoparticles
- Photosynthetic Processes and Mechanisms
- Advanced X-ray Imaging Techniques
- Optical measurement and interference techniques
- Engineering Applied Research
- Engineering Structural Analysis Methods
- Cell Image Analysis Techniques
- Advanced Optical Imaging Technologies
- Data Analysis with R
- Spreadsheets and End-User Computing
- Gyrotron and Vacuum Electronics Research
- Statistical and Computational Modeling
University of Modena and Reggio Emilia
2020-2025
Istituto Nanoscienze
2018-2024
We report the first experimental demonstration of an electrostatic electron orbital angular momentum (OAM) sorter, which can be used to analyze OAM states electrons in a transmission microscope. verify sorter functionality for several beams possessing different superpositions states, and use it record spectra. Our current has resolution 2 units h/bar - reduced Planck constant. It is expected increase optimal 1 future via fine control sorting phase elements.
The experimentally retrieved value of the optical extinction cross section per unit length, σL,extNT, individual MoS2 multiwall nanotubes (NTs) is here reported over 440–940 nm wavelength range for light polarization both parallel and perpendicular to nanotube longitudinal axis. impact diameter environment on σL,extNT addressed with diameters 120 220 in suspended, sapphire-supported, PMMA-supported configurations. Measuring utmost importance given wide size dispersion intrinsic synthesis...
We report the use of an electrostatic micro-electromechanical systems-based device to produce high quality electron vortex beams with more than 1000 quanta orbital angular momentum (OAM). Diffraction and off-axis holography experiments are used show that diameter in diffraction plane increases linearly OAM, thereby allowing content be calibrated. The realization even larger values OAM is currently limited by breakdown voltage device. Potential solutions overcome this problem discussed.
With operando transmission electron microscopy visualizing the solid–solid electrode–electrolyte interface of silicon active particles and lithium oxide solid electrolyte as a model system, we show that (de)lithiation (battery cycling) does not require all to be in direct contact with electrolytes across length scales few hundred nanometers. A facile redistribution occurs between interconnected indicates necessarily become isolated individual due loss contact. Our results have implications...
A convolutional neural network is used to align an orbital angular momentum sorter in a transmission electron microscope. The method demonstrated using simulations and experiments. As result of its accuracy speed, it offers the possibility real-time tuning other optical devices beam shaping configurations.
Solving challenges of enhanced imaging (resolution or speed) is a continuously changing frontier research. Within this sphere, ghost (and the closely related single-pixel imaging) has evolved as an alternative to focal plane detector arrays owing advances in detectors and/or modulation devices. The interest these techniques due their robustness varied sets patterns and applicability broad range wavelengths compatibility with compressive sensing. To achieve better control illumination...
Beam shaping - the ability to engineer phase and amplitude of massive massless particles has long interested scientists working on communication, imaging foundations quantum mechanics. In light optics, electromagnetic waves (photons) can be achieved using techniques that include, but are not limited to, direct manipulation beam source (as in X-ray Free Electron Lasers (XFELs) Synchrotrons), deformable mirrors, spatial modulators, mode converters holograms. The recent introduction holographic...
Chirality can appear at many length scales in nature. In this study the authors introduce planar chirality as a quantitative geometric measure of for two-dimensional objects. They apply to evaluate nanometer-sized structures with an electron microscope. employ innovative electron-optics device, orbital-angular-momentum sorter, which applies log-polar conformal mapping wave function and reaches near-optimal resolution orbital angular momentum.
By means of numerical simulations, we demonstrate the innovative use computational ghost imaging in transmission electron microscopy to retrieve images with a resolution that overcomes limitations imposed by coherent aberrations. The method requires measuring intensity on single pixel detector series structured illuminations. success technique is improved if probes are made resemble sample and patterns cover area interest evenly. using simple 8 electrode device as specific example, twofold...
Abstract We report on the automatic alignment of a transmission electron microscope equipped with an orbital angular momentum sorter using convolutional neural network. The network is able to control all relevant parameters both electron-optical setup and external voltage source without input from user. It can compensate for mechanical optical misalignments sorter, in order optimize its spectral resolution. completed over few frames be kept stable by making use fast fitting time
By means of numerical simulations, we demonstrate the innovative use computational ghost imaging in transmission electron microscopy to retrieve images with a resolution that overcomes limitations imposed by coherent aberrations. The method requires measuring intensity on single pixel detector series structured illuminations. success technique is improved if probes are made resemble sample and patterns cover area interest evenly. using simple 8 electrode device as specific example, 2-fold...
<title>Abstract</title> Rotational invariance is a fundamental aspect of symmetry in scattering processes from atomic potentials. Here, we introduce new approach for measuring orbital angular momentum (OAM), key descriptor rotational symmetry, during measurements transitions. We use an electron optical ‘OAM sorter’ combination with energy-loss spectroscopy (EELS) to perform unified spectral analysis the π* and σ* anti-bonding transitions hexagonal boron nitride on scale. The allows...
Abstract Tuneable phase plates for free electrons are a highly active area of research. However, their widespread implementation, similar to that spatial light modulators in optics, has been hindered by both conceptual and technical challenges. A specific challenge involves the need minimize obstruction electron beam supporting films electrodes. Here, we describe numerical analytical mathematical frameworks three-dimensional stacks can be used provide near-arbitrary shaping with minimal obstruction.
The orbital angular momentum (OAM) sorter is an electron optical device for the measurement of electron's OAM. It based on two phase elements, which are referred to as "unwrapper" and a "corrector" located in Fourier conjugate planes. simplest implementation electrostatic such charged needle unwrapper electrodes with alternating charges or potentials corrector. Here, we use formal analogy between shifts introduced by vertical currents propose alternative designs magnetic fields. We this...
Modern nanotechnology techniques offer new opportunities for fabricating structures and devices at the micrometer sub-micrometer level. Here, we use focused ion beam to realize micrometer-sized Janus bimetallic cylinders acting as drift tube devices, which are able impart a controlled phase shift an electron wave. The results from presence of contact potentials in cylinders, similar manner electrostatic Aharonov–Bohm effect wires. We Fraunhofer interference demonstrate that such introduce...
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An abstract is not available for this content so a preview has been provided. As you have access to content, full PDF via the ‘Save PDF’ action button.
An abstract is not available for this content so a preview has been provided. As you have access to content, full PDF via the ‘Save PDF’ action button.
We report on the automatic alignment of a transmission electron microscope equipped with an orbital angular momentum sorter using convolutional neural network. The network is able to control all relevant parameters both electron-optical setup and external voltage source without input from user. It compensate for mechanical optical misalignments sorter, in order optimize its spectral resolution. completed over few frames can be kept stable by making use fast fitting time