Measuring the orbital angular momentum spectrum of an electron beam
Vincenzo Grillo,Amir H. Tavabi,F. Venturi,Hugo Larocque,Roberto Balboni,Gian Carlo Gazzadi,Stefano Frabboni,Peng-Han Lu,Erfan Mafakheri,Frédéric Bouchard,Rafal E. Dunin-Borkowski,Robert W. Boyd,Robert W. Boyd,Martin P. J. Lavery,Miles J. Padgett,Ebrahim Karimi +15 more
Reads0
Chats0
TLDR
This work proposes, design and demonstrates the performance of a device based on nanoscale holograms for measuring an electron's OAM components by spatially separating them and employs the device to analyse the OAM spectrum of electrons that have been affected by a micron-scale magnetic dipole, establishing that the sorter can be an instrument for nanoscales magnetic spectroscopy.Abstract:
Electron waves that carry orbital angular momentum (OAM) are characterized by a quantized and unbounded magnetic dipole moment parallel to their propagation direction. When interacting with magnetic materials, the wavefunctions of such electrons are inherently modified. Such variations therefore motivate the need to analyse electron wavefunctions, especially their wavefronts, to obtain information regarding the material's structure. Here, we propose, design and demonstrate the performance of a device based on nanoscale holograms for measuring an electron's OAM components by spatially separating them. We sort pure and superposed OAM states of electrons with OAM values of between -10 and 10. We employ the device to analyse the OAM spectrum of electrons that have been affected by a micron-scale magnetic dipole, thus establishing that our sorter can be an instrument for nanoscale magnetic spectroscopy.read more
Citations
More filters
Journal ArticleDOI
Laguerre-Gaussian mode sorter.
TL;DR: In this paper, the authors present a multi-plane light conversion scheme for large number of spatial modes in a scalable fashion, where the number of phase plates required scales with the dimensionality of the transformation.
Journal ArticleDOI
Theory and applications of free-electron vortex states
Konstantin Y. Bliokh,Konstantin Y. Bliokh,Igor P. Ivanov,Giulio Guzzinati,Laura Clark,Laura Clark,R. Van Boxem,Armand Béché,Roeland Juchtmans,Miguel A. Alonso,Peter Schattschneider,Franco Nori,Franco Nori,Johan Verbeeck +13 more
TL;DR: In this paper, the main properties of electron vortex states, experimental achievements and possible applications within transmission electron microscopy, as well as the possible role of vortex electrons in relativistic and high-energy processes are described.
Journal ArticleDOI
Ultrafast generation and control of an electron vortex beam via chiral plasmonic near fields.
Giovanni Maria Vanacore,Gabriele Berruto,I. Madan,Enrico Pomarico,Paolo Biagioni,R. J. Lamb,Damien McGrouther,Ori Reinhardt,Ido Kaminer,Brett Barwick,Hugo Larocque,Vincenzo Grillo,Ebrahim Karimi,F. J. García de Abajo,F. J. García de Abajo,Fabrizio Carbone +15 more
TL;DR: In this paper, femtosecond chiral plasmonic near fields enable the generation and dynamic control on the ultrafast timescale of an electron vortex beam, and the vortex structure of the resulting electron wavepacket is probed in both real and reciprocal space using ultrafast transmission electron microscopy.
Journal ArticleDOI
Ultrafast nanoimaging of the order parameter in a structural phase transition
TL;DR: Ultrafast dark-field electron microscopy is introduced to map the order parameter across a structural phase transition in the layered material 1 T-polytype of tantalum disulfide, and the distinctive benefits of selective contrast enhancement will inspire future beam-shaping technology in ultrafast transmission electron microscope.
Journal ArticleDOI
Generalized optical angular momentum sorter and its application to high-dimensional quantum cryptography.
Hugo Larocque,Jérémie Gagnon-Bischoff,Dominic Mortimer,Yingwen Zhang,Frédéric Bouchard,Jeremy Upham,Vincenzo Grillo,Robert W. Boyd,Ebrahim Karimi +8 more
TL;DR: This work reports the implementation of a device capable of sorting a beam based on its OAM and polarization content, which could be of use in works employing both of these degrees of freedom as information channels.
References
More filters
Journal ArticleDOI
Entanglement of the orbital angular momentum states of photons
TL;DR: This work demonstrates entanglement involving the spatial modes of the electromagnetic field carrying orbital angular momentum, which provides a practical route to entangled states that involves many orthogonal quantum states, rather than just two Multi-dimensional entangled states could be of considerable importance in the field of quantum information, enabling, for example, more efficient use of communication channels in quantum cryptography.
Journal ArticleDOI
Entanglement of Orbital Angular Momentum States of Photons
TL;DR: In this article, the orbital angular momentum of photons is exploited to achieve multi-dimensional entanglement in higher dimensions, i.e., the state of the electromagnetic field with phase singularities (doughnut modes).
Journal ArticleDOI
Measuring the orbital angular momentum of a single photon.
TL;DR: This work demonstrates its viability by sorting four different orbital angular momentum states, and is thus able to encode two bits of information on a single photon, having implications for entanglement experiments, quantum cryptography and high density information transfer.
Journal ArticleDOI
Efficient sorting of orbital angular momentum states of light.
Gregorius C. G. Berkhout,Martin P. J. Lavery,Johannes Courtial,Marco W. Beijersbergen,Miles J. Padgett +4 more
TL;DR: A method to efficiently sort orbital angular momentum states of light using two static optical elements that perform a Cartesian to log-polar coordinate transformation, converting the helically phased light beam corresponding to OAM states into a beam with a transverse phase gradient.
Journal ArticleDOI
Production and application of electron vortex beams
TL;DR: This technique is a reproducible method of creating vortex electron beams in a conventional electron microscope, and it is demonstrated how they may be used in electron energy-loss spectroscopy to detect the magnetic state of materials and describe their properties.