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Prof. Andrea Konečná (BUT Brno), Martin Kozák (Charles University, Faculty of Mathematics and Physics), Peter Hommelhoff (Laserphysik, FAU, Erlangen)21/09/2026, 09:30
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Zhexin Zhao (Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg)21/09/2026, 09:40
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4. Clarisse Woodahl - Free-electron spin polarization on a laser driven nanostructure chip (invited)Clarisse Woodahl (Stanford University)21/09/2026, 10:15
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Ofer Kfir (School of Electrical and Computer Engineering, Tel Aviv University)21/09/2026, 11:20
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Michael Krueger (Technion – Israel Institute of Technology, 32000 Haifa, Israel)21/09/2026, 11:55
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Thomas Juffmann (Max Perutz Labs, University of Vienna)21/09/2026, 13:30
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Yuya Morimoto (RIKEN)21/09/2026, 14:05
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Sascha Schäfer (Univ. Regensburg)21/09/2026, 14:40
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Oh-Hoon Kwon (Korea Advanced Institute of Science and Technology)21/09/2026, 15:45
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Prof. Ding-shyue Yang (University of Houston)21/09/2026, 16:20
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Petr Koutenský (Charles University)21/09/2026, 16:55
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Mark van Rijt (Thermo Fisher Scientific)21/09/2026, 17:15
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Sophie Meuret (CEMES)22/09/2026, 08:30
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Peter Baum (Universität Konstanz, Fachbereich Physik)22/09/2026, 09:05
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22/09/2026, 09:40
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herman batelaan (University of Nebraska-Lincoln)22/09/2026, 10:30
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F. Javier García de Abajo (ICFO-Institut de Ciencies Fotoniques)22/09/2026, 11:05
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Yiqi Fang (FAU)22/09/2026, 11:40
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Cruz Ignacio Velasco (ICFO - The Institute of Photonic Sciences)22/09/2026, 12:00
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22/09/2026, 13:30
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22/09/2026, 15:00
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Stefan Jorda (WE Heraeus Foundation)23/09/2026, 08:30
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Bolin Liao (Department of Mechanical Engineering, UCSB)23/09/2026, 08:50
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Bradley J. Siwick (Department of Physics, Center for the Physics of Materials, McGill University, Montreal, Canada,Department of Chemistry, McGill University, Montreal, Canada)23/09/2026, 09:25
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Philipp Haslinger (Atominstitut, TU-Wien)23/09/2026, 10:30
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Armin Feist (Max Planck Institute for Multidisciplinary Sciences)23/09/2026, 11:05
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Leshi Zhao (Peking University)23/09/2026, 11:40
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Aviv Karnieli (Stanford University)23/09/2026, 13:00
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Isobel Bicket (isobel.bicket@tuwien.ac.at)23/09/2026, 13:35
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Jan-Wilke Henke (MPI for Multidisciplinary Sciences)23/09/2026, 13:55
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Nahid Talebi (Deutschland)24/09/2026, 08:30
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Albert Polman (AMOLF)24/09/2026, 09:05
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Osip Schwartz (Weizmann Institute of Science)24/09/2026, 09:40
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Heyu WANG (CNRS Laboratoire de physique des solides)24/09/2026, 10:30
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Alissa Freilinger (CNRS/Université Paris-Saclay)24/09/2026, 10:50
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Feiyan Zhao24/09/2026, 11:10
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24/09/2026, 11:30
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Mr Seung-Woo Lee (Korea Advanced Institute of Science and Technology (KAIST))Poster
Cathodoluminescence (CL) is a technique for investigating various electron–matter interactions by measuring electron-beam-induced photon emission. It provides access to nanoscale luminescence processes such as defect emission¹, carrier recombination², carrier diffusion³, and plasmon-related emission⁴. Time-resolved (TR) CL combined with ultrafast transmission electron microscopy (UTEM) offers...
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136. A platform for studying ultrafast electron-light interactions in a scanning electron microscopeGilbertas Umbrazunas (FAU Erlangen-Nürnberg/LMU Munich)Poster
Ultrafast electron microscopy enables the investigation of electron–photon interactions with femtosecond temporal and nanometer spatial resolution. We have developed a laser-integrated SEM for PINEM and ponderomotive electron–light interaction experiments. Electrons are initially generated by laser-triggered emission from a Schottky field emitter. Downstream, the electrons can interact with...
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Anne Weber (King's College London)Poster
Light-matter interactions in the strong-field regime, such as high-harmonic generation (HHG), typically give rise to highly-oscillatory
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integrals, which are often solved using saddle-point methods. Not only do these methods promise a faster computation, but they also inform a more intuitive understanding of the process in terms of quantum orbits, as the saddle points correspond to interfering... -
Tomáš Chlouba (FAU)Poster
Ultrafast scanning electron microscopy (USEM) combines the versatility of a conventional SEM with the ability to generate femtosecond electron pulses through laser-driven photoemission. By controlling the cathode excitation wavelength and electron gun settings, the properties of the emitted electron beam, like bunch charge, energy width and bunch duration, can be tailored over a wide range. We...
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Ms Feiyan Zhao
Angular-Resolved Polarimetry of Smith-Purcell Radiation
Feiyan Zhao1,*, Zahava Barkay2, Ady Arie1,2
1School of Electrical and Computer Engineering, Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv 6997801, Israel.
2 Jan Koum Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv 6997801, Israel.
*feiyanz@mail.tau.ac.ilFree-electron–photon...
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ofer kfir (Tel Aviv University)Invited talk
Quantum electron-photon coupling has emerged from two seemingly distinct interactions of free-electron beams with light: stimulated energy gain- and loss driven by strong lasers, and spontaneous radiative electron-energy loss. The strength of the quantum coupling theory was their unification into one phenomenon, governed by one coupling amplitude, $g_{Qu}$. As a result, existing theory focuses...
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Pawel Szczypkowski (Atominstitut, TU-Wien)Poster
Over the past decades, experimental quantum physics has developed rapidly in the realm of photonics, establishing a mature experimental toolbox that exploits quantum effects across a broad range of demonstrations and technologies. Representative examples include Bell tests, entanglement swapping, quantum teleportation, ghost imaging, imaging with undetected photons, NOON-state interferometric...
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Alissa M. Freilinger (Université Paris-Saclay, CNRS, LPS Orsay, 91400 Orsay, France)Poster
Color centers are a solid-state realization of a two-level system (TLS). They are of special technological interest because TLS can be used as single photon emitters [1, 2]. The correlation of EELS and CL may combine the sensitivity of CL with the spatial resolution of EELS [3]. It is therefore particularly appealing for studying color centers at the nanoscale, where their optical properties...
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Bradley J. Siwick (Department of Physics, Center for the Physics of Materials, McGill University, Montreal, Canada,Department of Chemistry, McGill University, Montreal, Canada)Invited talk
Ultrafast electron diffraction is now a relatively mature approach for directly probing structural transformations in molecules and materials at the atomic-level. More recently this pump-probe technique has been extended beyond crystallographic/Bragg features to include phonon-diffuse scattering, which interrogates non-equilibrium structural fluctuations (about the average structure) and...
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Santiago Steven Beltran Romero (TU Wien Atominstitut)Poster
Coherent Cathodoluminescence from a Dielectric Slab: A Framework for Electron-Photon Entanglement
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S. Beltrán-Romero† 1,2, I. C. Bicket1,2, P. Haslinger1,2, D. Rätzel3,4
1Vienna Center for Quantum Science and Technology, TU Wien, Atominstitut, Vienna, Austria
2University Service Centre for Transmission Electron Microscopy, TU Wien, Vienna, Austria
3Department of Physics and Astronomy,... -
Alexandr Vasilyev (Weizmann Institute of Science)Poster
A coherent coupler for high-energy electron beams would enable quantum-optical experiments with electrons, in particular, the implementation of quantum metrology techniques in transmission electron microscopy (TEM). Bragg scattering of electrons by laser radiation is a promising candidate for realizing a coherent electron beamsplitter. The main challenge for achieving the Bragg regime with...
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Zhexin Zhao (FAU)Invited talk
The interaction between light and free electrons not only provides a promising pathway toward the miniaturization of electron accelerators, but also enables rich quantum effects that can drive frontier applications such as quantum sensing and quantum light sources with high spatial and temporal resolution. This talk will include the following 3 aspects of free-electron—light interaction:...
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Valerio Di Giulio (Max Planck for Multidisciplinary Sciences, Göttingen (Germany))Poster
Under suitable conditions, particles with the same sign of charge confined in a potential can form ordered structures stabilized by Coulomb repulsion, known as Coulomb crystals. This phase of matter has been extensively studied and observed in systems ranging from cooled ions in storage rings [1] to electrons in one- and two-dimensional materials [2,3]. The formation of a Coulomb crystal is...
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Elias Pescoller (TU Wien)Poster
Free electrons serve as quantum probes that can become coherently correlated with other quantum systems, offering access to advanced metrological resources. We present a scheme that allows electrons to be coherently coupled to a trapped-ion quantum computer via the Coulomb interaction. By preparing the trapped ions in non-classical states of motion, an effective Pauli-X interaction between the...
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Ms Hadar Aharon (School of Electrical and Computer Engineering, Tel Aviv University)Poster
In this work we map qualitatively and quantitatively the sub-bandgap cathodoluminescence of optomechanical silicon nanobeam resonators with $10$ and $20$ nanometer resolution. By analyzing the symmetric and anti-symmetric optical modes both locally and spectrally in the far-field, we measure for the first time the sign-flip of the anti-symmetric mode in such one-dimensional cavities. To...
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Jan-Wilke Henke (MPI for Multidisciplinary Sciences, Göttingen)Poster
Quantum entanglement is one of the central resources underlying many emerging quantum technologies, including quantum-enhanced sensing. Transferring established concepts from optical quantum sensing to electron microscopy promises new routes towards enhanced measurement sensitivity and imaging beyond the standard quantum limit. Coherent inelastic interactions between free electrons and optical...
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Dr Yuya Morimoto (RIKEN)Invited talk
We report the attosecond optical shaping of electron beams using thin membranes in a newly developed apparatus capable of delivering high-current pulses. To record attosecond streaking spectrograms, we minimize the spread of electron-light delays in the streaking interaction by optimizing the membrane arrangement. The recorded spectrograms exhibit net acceleration and deceleration, as well as...
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Florian Spickmann (MPI for Multidisciplinary Sciences, Göttingen)
Ultrafast Transmission Electron Microscopy (UTEM) with field-emitter sources [1] is one of the most advanced techniques to study materials dynamics on the nanoscale. Spatially coherent femtosecond electron pulses serve as nearly universal probes in ultrafast imaging, diffraction and spectroscopy. Despite the reduced complexity of electron-beam instrumentation at lower energies, Ultrafast...
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Přemysl Pachl (Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic)Poster
Summary:
The project aims to modify a commercial scanning electron microscope with laser-based electron pulse generation and electron beam shaping to improve the microscope’s spatial resolution while enabling ultrafast, time-resolved electron microscopy.Introduction:
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To date, there is no product on the scanning electron microscope (SEM) market that can form and modify electron... -
Zdeněk Nekula (Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic)Poster
Accurate modelling of coherent electron wave propagation is essential for understanding and designing modern electron-optical systems, particularly in experiments involving structured beams and electron–photon interactions. However, numerical wave-optical simulations in electron microscopy face severe computational challenges due to the extremely short electron wavelength and the large...
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Srinath Bulusu (TU Vienna)Poster
The interaction of electron beams with tailored light fields offers promising opportunities for beam shaping. Due to energy-momentum conservation at least two free-space light modes are required to enable a phase-matched interaction with electrons. Slight detuning from phase-matching leads to ponderomotive potentials acquiring a relative velocity with respect to the electron. Superposition of...
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Lorenz Möhrle (University of Konstanz)Poster
The coherent interaction of optical fields with electron beams underpins key developments in ultrafast electron microscopy and free-electron quantum optics. However, direct coupling between light and free electrons is prohibited in free space by energy–momentum conservation. Here, we overcome this limitation by using longitudinally polarized optical fields at a thin membrane, where the...
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Dr Fatemeh Chahshouri (Kiel University)Poster
Recent advances in ultrafast electron microscopy have highlighted the importance of understanding the generation, control, and characterization of pulsed electron beams for studying electron-light-matter interactions at the nanoscale. Here, we present the development and characterization of an ultrafast scanning electron microscope (USEM) based on a laser-driven Schottky field-emission source,...
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Phila Rembold (Atominstitut, TU Wien)Poster
Entanglement is at the basis of most modern quantum technologies, where continuous degrees of freedom play a special role: They allow for imaging and provide infinite-dimensional Hilbert spaces, promising rich structures that can be exploited for improved resolution and information processing. On the flipside, this complexity requires a different experimental arsenal to access. Reliable...
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Muhammad Imran (National Institute of Lasers and Optronics College, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan)Poster
Quantum electron–photon interactions constitute the fundamental physical mechanism underlying both the generation and detection of light in quantum optical systems. In modern quantum communication platforms, these interactions do not serve as auxiliary processes but directly determine the measurable properties of quantum states, including coherence, entanglement, and correlation statistics....
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Jakub Urban (ICFO - The Institute of Photonic Sciences)Poster
A huge disadvantage of conventional electron energy-loss spectroscopy (EELS) is the low scattering probability. Most of the electrons do not interact with the sample and contribute to the zero-loss peak, which is several orders of magnitude larger than the signal of interest. This is particularly limiting when probing samples that are sensitive to electron irradiation. . In contrast, when...
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Isobel Bicket (isobel.bicket@tuwien.ac.at)Poster
Electron-photon interactions have long been studied and utilized in electron microscopy (EM) for studying nanoscale optical phenomena [1] and, more recently, for developing free-electron quantum optics [2, 3]. Of particular importance in making EM into a powerful platform for quantum physics and imaging techniques is the study of correlations between electrons and cathodoluminescence (CL)...
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Sotatsu Yanagimoto (Institute of Science Tokyo)Poster
Recently, super-bunching ($g^{(2)}(\tau)>2$) has been experimentally observed in cathodoluminescence (CL) photon-correlation measurements and used to analyze luminescence dynamics [1]. This bunching behavior originates from both external and internal factors: temporal fluctuations in electron arrival and the inherent photon statistics generated by individual excitation events. In this work, we...
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Ondrej Ludmil Shanel (Thermo Fisher Scientific)Invited talk
Fast beam blanking provides a direct way to control electron dose and time structure in (S)TEM without altering the imaging optical conditions. The NanoPulser is an electrostatic beam blanker [Mv1.1]integrated between the C1 aperture and lens on the Iliad (S)TEM platform. It provides guaranteed sub-10 ns unblanking (3.5 ns demonstrated), repetition rates up to 1 MHz, and control through...
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Yiqi Fang (Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg)
Abstract: We experimentally demonstrate free-electron spectral shearing interferometry as a universally applicable approach to measure free-electron quantum states in the time-energy domain. © 2026 The Author(s)
Introduction
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The determination of a complete quantum-state description for a given quantum-mechanical system is a fundamental task in quantum physics, and necessary to... -
Clarisse Woodahl (Stanford University)Invited talk
Spin-polarized electron sources can provide magnetic and spin-dependent information about materials and systems with nanoscale resolution. We present a theoretical design to spin polarize free-electrons using an integrated photonics chip illuminated by lasers. The design consists of two interaction stages separated by a free space drift to induce spin-dependent features in the electron...
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Hebrew Benhur Crispin (Kiel University)Poster
Free electrons are powerful nanoscale probes of light–matter interactions, providing both high spatial and temporal resolution. Recent advances in time-resolved cathodoluminescence (CL) spectroscopy have enabled the study of coherent ultrafast dynamics in quantum emitters. In addition, electron-beam excitation of defects can lead to controllable nonclassical effects, such as photon...
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Philipp Haslinger (TU Wien)Invited talk
Coherent control and detection of quantum systems are central to quantum technologies. Beyond excitation with optical and microwave fields, free-space electrons can be used to manipulate and detect quantum systems with unique spatial and spectroscopic resolution. In this talk, I outline the theoretical framework [1, 2] showing that the non-radiative near-field of a spatially modulated electron...
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Roy Shiloh (HUJI Institute of Applied Physics)Poster
Dielectric laser acceleration is a concept where engineered nanophotonic structures, along with femtosecond laser pulses, are used to couple photon energy to free electrons passing in close proximity to them [1]. A viable and rather direct application is electron acceleration on a chip, which has recently been shown to breach the 30 keV limit of standard scanning electron microscopes with...
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Sergei Bogdanov (Technische Universität Wien Atominstitut – Institute of Atomic and Subatomic Physics)Poster
Coincidence imaging, also known as ghost imaging, is a technique that exploits correlations between two particles to reconstruct information about a specimen. The particle that relays the spatial information about the object remains completely noninteracting, while the particle used to probe the object is not spatially resolved. While ghost imaging has been primarily implemented on photonic...
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Florian Fleischmann (FAU Erlangen-Nürnberg)Poster
We investigate the spatial second-order correlation function of two scattering electrons in a Hanbury Brown-Twiss like experiment. First, we consider semi-classically the effects of the Pauli exclusion principle and Coulomb repulsion on the expected correlation pattern. This is followed by a full quantum treatment of the problem. We start with fermionic field operators in the Heisenberg...
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Leshi Zhao (Peking University)Poster
While the spatial structuring of free electrons plays a crucial role in nanoscale photonics, their interactions are conventionally modeled within semiclassical approximation. Here, we develop a full quantum description of a free electron interacting with a vortex near field. With the quantized theory, we show that the interaction can generate high-dimensional entanglement involving the...
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Lukas Jehn (Max-Planck-Institute for Multidisciplinary Sciences)Poster
Entanglement, especially between bound electrons and photons, forms the basis of most modern quantum technology. The recent observation of entanglement between free electrons and photons in an electron microscope [1,2], could constitute an important step in the development of free-electron quantum optics. While these proof-of-principle experiments open new avenues for integrating quantum...
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Miccola Bondarenco (NSC Kharkov Institute of Physics and Technology, Ukraine)
In the theory of characteristic X-ray radiation, there remain several discrepancies with the experimental observations, including astrophysical ones. One of the reasons for them may be the simplified treatment of the inner atomic shell wave functions. Even in Hartree-Fock methods, inner shell trial functions are often chosen in a relatively simple form, structurally close to that for hydrogen,...
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Mr Arkajyoti Maity (Max Planck Institute for the Physics of Complex Systems, Dresden)Poster
We theoretically investigate the prospect of inducing a non-trivial, non-linear Hall response in Dirac materials obeying both inversion and time-reversal symmetries, specifically pristine graphene. This is possible by
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creating a non-thermal electronic distribution in the system by driving it with an intense sub-cycle laser pulse. The resultant non-equilibrium state, generated by non-adiabatic... -
Marek Zálešák (Brno University of Technology, Central European Institute of Technology)Poster
Focused electron beams are ideal probes for investigating low-energy excitations, such as phonons or plasmons, at the nanoscale [1]. Combining scanning transmission electron microscopy (STEM) with spectroscopic techniques, such as electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL), allows us to obtain nanometer spatial resolution combined with spectral resolution in the...
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Sophie Meuret (CEMES)Invited talk
Using an electron microscope to study the optical properties of semiconductors has sparked a lot of research over the years [1], [2] ,[3]. Indeed, despite the complexity of a TEM experiment compared to a full optical one, the increase in spatial resolution, broad excitation, and compatibility with other electron beam-based techniques has been a strong motivation. With the new generation of...
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Mr Tomáš Brada (Brno University of Technology)Poster
Electron microscopes have achieved remarkable performance in spatial, temporal, and energy resolution, and their development continues to advance. Modern instruments increasingly incorporate automated procedures, multiple detectors, and aberration correctors to produce smaller and more precise electron probes. However, such correctors are often complex and costly.
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A promising alternative... -
River Robles (FAU Erlangen-Nürnberg/LMU Munich)Poster
Ultrafast electron microscopes combine high coherence electron emitters with laser-triggered photoemission to achieve simultaneous nanometer spatial, femtosecond temporal, and sub-eV spectral resolution. Those properties can be further improved, and more novel wavefunction shaping performed, through interactions of the electrons with light fields. We present progress towards the realization...
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Prof. Sascha Schäfer (Univ. Regensburg)Invited talk
Ultrafast nanoscale imaging utilizing femtosecond electron pulses offers a unique experimental access to structural, electronic and spin degrees-of-freedom. High-resolution, phase-based imaging methodologies require electron pulses with high spatial coherence and sufficient average electron current to outpace sample drift. To a large extent, electron beam properties are already set by the...
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GOVIND UMMETHALA (Ernst Ruska Centre-Forschungszentrum Juelich GmbH)Poster
In the transmission electron microscope (TEM), high temporal resolution can be achieved using short electron pulses, typically in a pump-probe stroboscopic scheme. Temporal resolution can be described in terms of a convolution of pump and probe pulses, in addition to jitter arising from random phase shifts in their arrival times. The primary methods for generating short electron pulses in the...
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Daniel Kazenwadel (Uni Konstanz)Poster
The absorption of light is one of the most fundamental processes in condensed-matter physics and optics. Here we investigate whether laser light is absorbed by a crystalline material as an electromagnetic wave or as localized photon energies. We excite the first-order phase transition of vanadium dioxide with laser pulses of sufficient frequency to overcome the band gap but with insufficient...
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Ran Dekel (Tel Aviv University)Poster
With the rising interest in using cathodoluminescence (CL) to probe exciton physics of 2D materials, the weak signal originating from scattering off a single atomic layer remains a significant challenge. In this work, we present high-resolution CL measurements of suspended single-, double, and multi- layers of transition-metal dichalcogenides (TMDCs). These require the use of slow electrons to...
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Osip Schwartz (Weizmann Institute of Science)
In 1936, Euler and Heisenberg (Z. Phys. 98, 714–732, 1936) showed that in quantum electrodynamics (QED), the coupling of light to virtual electron-positron pairs gives rise to effective photon-photon interactions. Thus, the physical vacuum possesses an extremely faint nonlinear-optical susceptibility. Ninety years later, the quest to measure the electromagnetic nonlinearity of vacuum (EMNV) is...
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Wu Wen (School of Physics, Peking University)Poster
We study tunable, nanoscale, femtosecond coherent radiation based on a coupled nanowire pair structure, which is transversely excited by a strong, linearly polarized laser pulse. The structure can function as a nanoscale undulator: the electrons moving through the nanogap are driven by a spatially periodic, transverse optical near field. We show that the near field can actively shape the...
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Alvaro Rodriguez Echarri (AMOLF - Center for Nanophotonics, NWO Institute)Poster
The controlled shaping of free-electron wavepackets using optical near-fields is emerging as a powerful tool for ultrafast electron science, with applications ranging from attosecond electron pulse generation to strong-field electron microscopy [1]. In photon-induced near-field electron microscopy (PINEM), a swift electron exchanges discrete quanta of photon energy with an optical near-field,...
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Ritik Tanwar (Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.)Poster
The performance of semiconductor devices depends critically on structural integrity at both surface/interface and bulk, making nanoscale defect characterisation essential. Techniques such as TEM, DLTS, EBIC, and ECCI involve trade-offs between non-destructive analysis, spatial resolution, and surface sensitivity. Although SEM avoids the destructive sample preparation required for TEM,...
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Mr Michael Foltýn (Brno University of Technology)Poster
While gold-based plasmonic nanostructures show great promise for plasmonic applications, their wider use is limited by high manufacturing costs and a limited plasmon energy range constrained by interband transitions and subsequent damping of localised surface plasmon resonances. These limitations are a key motivation for exploring alternative, non-noble metal options. Lead and tin have been...
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Mr Mitja Funk (CAU Kiel)Poster
The coherent interaction of free electrons with optical near-fields and free-space radiation can induce complex wave function dynamics ranging from PINEM sideband formation to stimulated Compton scattering and near-field mediated Kapitza-Dirac effects. Numerical simulations based on the time-dependent Schrödinger equation often provide accurate insight into such phenomena beyond...
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Thomas Juffmann (Max Perutz Labs, University of Vienna)Invited talk
How can we see nanoscale light–matter interactions and fast dynamics at interfaces without damaging fragile samples? In this colloquium, I will introduce Optical Near-field Electron Microscopy (ONEM), a new imaging approach that combines the non-invasiveness of light optics with high spatial resolution enabled by electron optics. The core idea is simple [1]: a specimen is illuminated with...
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Yi Yang (The University of Hong Kong)
Optical parametric processes underpin quantum photonics, while free-electron--photon interactions offer agile pathways to generate nontrivial quantum photonic states. These threads have so far largely progressed independently, whereas placing free electrons in a driven nonlinear system can potentially activate coherent parametric interaction channels for joint state engineering of both types...
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Michael Kali (Weizmann Institute of Science)Poster
In transmission electron microscopy (TEM), biological samples are typically weak phase objects. High-contrast imaging of such specimens can be achieved with a Zernike phase plate, which shifts the phase of the unscattered wave by 90 degrees relative to the scattered waves, converting a microscope into an imaging interferometer. A promising approach to developing a phase plate for TEM is to use...
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Alberto TagliaferriPoster
Scanning electron microscopy (SEM) is widely used for rapid, nanoscale morphological imaging of bulk specimens. This success has also shaped its common role as a complementary characterization tool, rather than as a platform for spectroscopic and dynamical measurements. Recent developments in energy-selective electron detection, secondary-electron energy spectroscopy [1], reflected-electron...
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Neli Laštovičková Streshkova (Charles University)
Research on nanostructure and metamaterial fabrication benefits from microscopy techniques that enable imaging of electromagnetic near-fields with nanometer-scale resolution. Photon-induced near-field electron microscopy (PINEM) measures the effect of the Lorentz force component aligned with the electron propagation direction through changes in the electron energy spectrum, thereby quantifying...
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Pramod Yadawa (Veer Bahadur Singh Purvanchal University Jaunpur)Poster
Titanium diboride's thermophysical and ultrasonic properties are theoretically studied at various pressures. The Lennard-Jones Potential model technique approaches is used to evaluate second and third-order elastic constants (SOECs and TOECs) of TiB2 compound at different pressures (0-100GPa). The evaluated SOECs are used to determine along with particular orientation with the unique axis....
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Albert Polman (AMOLF)Poster
The interaction between free electrons and optical excitations in nanostructures forms the basis of electron-induced spectroscopic techniques such as cathodoluminescence (CL) spectroscopy and light generation processes such as transition radiation (TR), and Smith-Purcell emission. While these methods are commonly interpreted using a classical description of the electron as a moving point...
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Nahid Talebi (Deutschland)Invited talk
Quasiparticle interactions in low-dimensional and hybrid materials give rise to optical phenomena that do not exist in their isolated constituents. By coupling excitons, plasmons, phonons, and quantum emitters within engineered nanostructures, new opportunities emerge for controlling light–matter interactions, long-range energy transfer, and quantum coherence at the nanoscale. In this...
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John Gaida (QSEM GmbH)Poster
Ultrafast electron microscopy is an emerging field with a rapidly growing number of labs, and with it comes a need for robust, well-engineered platforms that can support increasingly complex experiments. We present a dedicated ultrafast scanning electron microscope built to bring quantum science to the SEM, now offered through the recently formed company QSEM. QSEM was founded by Claus Ropers,...
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Petr Koutenský (Charles University)Poster
Strong local enhancement of electromagnetic field of light is a key requirement in many fields of science ranging from nearfield microscopy, plasmonic biosensors, chemical catalysis or nonlinear photonics. One of the most common nanostructures capable of strong local electromagnetic field enhancement is a metallic nanotip. Computational methods are capable to accurately predict the properties...
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herman batelaan (University of Nebraska-Lincoln)Invited talk
Zeilinger’s dispersivity theorem predicts the absence of force, while Shelankov and Berry predict the presence of a force for the Aharonov-Bohm effect. An experiment is presented that supports Shelankov and Berry’s prediction, while theory is presented to encompass both predictions thus resolving this confusing problem [1]. Even if this issue is now resolved others remain [2]. We will present...
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Noam Paryanti (Tel Aviv university)
We define a free space qubit for free electron to be a system where an electron wavepacket located on the left side of some finite space represents $|1\rangle$ and the wavepacket on the right side represents $|0\rangle$. As the system propagates in time through a given potential set by a laser, the electron moves rapidly between 3 states: $|0\rangle$, $|1\rangle$ and...
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Dr Jing Li (Peking University)
Free-electron interactions with optical near fields are conventionally described as one-dimensional energy ladders, in which multicolor photon-exchange pathways can become spectrally degenerate. Here, we show that this degeneracy can be unfolded by coupling a single free electron to commensurate two-color optical vortices, thereby realizing a programmable synthetic lattice spanned by the...
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Prof. Ding-shyue (Jerry) Yang (University of Houston)Invited talk
Elastic mean free paths of medium-energy electrons are in the range of several to a few hundred nanometers depending on atomic numbers and densities of the materials probed. Consequently, electron diffraction in reflection geometry has natural surface sensitivity or even specificity for materials and interfacial research. In this talk, I discuss how reflection ultrafast electron diffraction...
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Václav Vít (Brno University of Technology, Faculty of Mechanical Engineering, Institute of Physical Engineering, Technická 2, 616 69, Brno, Czech Republic)Poster
While chiral plasmonic nanostructures are often characterized through optical circular dichroism, retrieving local chiroptical information from individual structures in the far field remains difficult [1, 2]. Using a transmission electron microscope, electron energy-gain spectroscopy (EEGS), and consequently photon-induced near-field electron microscopy, allows us to probe optically driven...
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Dr John Simonaitis (KeVEELS Detectors, Inc.)Poster
In recent years, there has been growing interest in exploring quantum electron optics in low-energy scanning electron microscope (SEM) systems. These offer numerous practical and technical advantages, including lower cost, substantially larger experimental space, and significantly stronger electron-photon coupling. Recent work has hypothesized that lower electron energies may unlock new...
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Haiwen Wang (ICFO)Poster
We introduce free electrons as powerful tools for probing deep-subwavelength structures of light known as superoscillatory electromagnetic fields. Their sub-nanometer spatial resolution allows free electrons to overcome the fundamental limitations of conventional optical-field characterization techniques. By exploiting the electron interaction with optical near fields, we theoretically...
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Marek Kuchař (Charles University, Faculty of Mathematics and Physics)Poster
Swift electrons in electron microscopy provide a unique tool for probing and manipulating nanoscale
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materials, enabling access to electronic, optical, and collective excitations through techniques
such as electron energy-loss spectroscopy and cathodoluminescence. A detailed understanding of the
underlying electron–sample interaction is essential for interpreting these signals and exploring... -
Michael Seifner (TU Wien)
Spin-dependent phenomena play a central role in determining the quantum and magnetic properties of materials. Techniques such as electron spin resonance (ESR) and nuclear magnetic resonance (NMR) use microwave (MW) radiation to coherently manipulate spin states and have become essential tools for studying spin systems [1,2]. However, these approaches typically measure the averaged response of...
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Prof. Bolin Liao (Department of Mechanical Engineering, UCSB)Invited talk
The spatial-temporal dynamics of photoexcited charge carriers in materials are crucial for a wide range of applications including photovoltaics, photocatalysis, and optoelectronics. To fully resolve the microscopic details of photoexcited carrier dynamics, a combination of high spatial and temporal resolution is required. Scanning ultrafast electron microscopy (SUEM) is a promising...
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Heyu Wang (CNRS Laboratoire de physique des solides)Poster
Electron energy loss spectroscopy (EELS) and Cathodoluminescence (CL) in a scanning transmission electron microscope (STEM) are now routinely used for investigating the nanoscale variations of optical signals in a variety of systems, and in particular plasmonic ones. Recently, experiments in which the energy loss is detected in coincidence with the subsequent emission of a photon – coined as...
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Tom Fraysse (CEMES, University of Toulouse and CNRS, 31055 Toulouse, France)Poster
Due to recent experimental developments in integrated photonics, the question of the Photon Induced Near-field Electron Microscopy (PINEM) in the low occupation regime – i.e. when the cavity is populated by a weak number of photons - has drawn an increasing theoretical and experimental interest [1-3]. Indeed, in this situation, the classical model of the electromagnetic field falls short to...
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Tim Dauwe (MPI for Multidisciplinary Sciences, Göttingen)Poster
Inelastic electron-light interaction in the TEM enables the imaging of optical near fields through techniques like photon induced near field electron microscopy (PINEM). The interaction of free electrons with localized, time-dependent electric fields modulates the longitudinal wave function and gives rise to a spectral comb consisting of characteristic sidebands separated by multiples of the...
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Dr Dingguo Zheng (Tel Aviv University)Poster
The excitation of photonic vacuum by the aloof propagation of free electrons near dielectric surfaces, as demonstrated in waveguides [1] and microresonators [2], has been considered to be directly linked to the electric-field component parallel to the electron propagation direction [3,4]. Our quantum theory reveals a more general interaction that also depends on the transverse electric field....
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Yoshie Murooka (The University of Liverpool)Poster
Fast dynamics occurring at the sub-nanometer scale under irradiations have been advanced over 30 years, for example, by introducing a 2D digital detector in STEM [1]. This introduction opened up dynamic observations at high spatial-, momentum-, and energy-resolutions with time resolution [2]. The temporal resolution of electron diffraction and microscopy [3,4,5] has been further boosted by...
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Cruz Ignacio Velasco (ICFO - The Institute of Photonic Sciences)Poster
The non-classical properties of quantum light are central to the advancement of high-precision measurement technologies. A prime example is the implementation of squeezed states for the detection of gravitational waves, a process that relies on detecting spatial modulations several orders of magnitude below the wavelength of the employed lasers [1]. In a similar vein, the so-called NOON...
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Armin Feist (Max Planck Institute for Multidisciplinary Sciences)Invited talk
Introducing concepts from quantum optics into electron microscopy promises novel avenues for nanoscale probing and excitation of solid-state and photonic systems [1]. However, this requires the capability to induce and detect correlated multi-electron/photon states. In particular, strong coupling and precise control schemes remain challenging.
My talk will discuss recent progress in the...
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Mr Parsa Darman (Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany)Poster
Exciton-photon coupling in the form of self-hybridized exciton polaritons in two dimensional Ruddlesden Popper perovskite (RPP) attracts much attention because this material offers a high exciton binding energy and a large oscillator strength even at micrometer thicknesses. RPP is a naturally stacked quantum well structure where the barrier is an organic molecule with relatively low dielectric...
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Floriana MorabitoPoster
Chemical versatility of monolayers of Transition Metal Dichalcogenides such as WS₂ makes them highly attractive for a wide range of applications, including optoelectronics as well as hydrogen catalysis. However, the role of defects and their impact on the electronic, optical and structural properties of TMDs remains a topic of ongoing debate.
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In this study, we rely on High-Angle Annular... -
Dr Aviv Karnieli (Stanford University)Invited talk
Free-electron quantum optics [1] explores quantum-coherent interactions between free-electron wavepackets, light, and matter, enabling ultrafast and deep-subwavelength studies of quantum correlations. A central achievement of the field has been the realization of electron–photon entanglement [2–5]. Beyond this, theory has predicted entanglement between free electrons and bound electrons [6,7],...
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Jakub Kratochvíl (Institute of Physical Engineering, Brno University of Technology)Poster
Localized surface plasmons (LSPs) can confine light to sub-wavelength dimensions, which is a key concept in the fast-growing field of nanophotonics. Thanks to their sub-nanometer spatial resolution, transmission electron microscopes (TEMs) are powerful and well-established tools for studying nanophotonic samples, e.g. by probing the energy of LSPs using electron energy-loss spectroscopy...
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Jan Antl (TU Wien), Mr Michael S. Seifner (TU Wien)Poster
Nuclear magnetic resonance (NMR) probes nuclear spins, while electron spin
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resonance (ESR) probes electron spins through transitions between Zeeman-split
energy levels in a magnetic field. Relaxation constants $T_1$, $T_2$, and $T_2^*$ are key
parameters in pulsed ESR measurements and spin dynamics [1]. Convention-
ally, these relaxation constants are measured using the same microwave... -
martino zanetti (Max Perutz Labs, University of Vienna)Poster
Quantum electron microscopy is an emerging research field at the intersection of electron microscopy, quantum optics, and nanophotonics. Free electrons can serve as powerful quantum probes, on par with photons in their ability to carry and transfer quantum information, generate entanglement within and with a specimen, and reveal previously inaccessible details on nanoscale quantum...
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Ms Ye-Jin Choi (Ulsan National Institute of Science and Technology)Poster
Understanding carrier dynamics in semiconducting materials is crucial for designing efficient photovoltaics and photocatalysts1. Conventional ensemble-averaged optical spectroscopic techniques, such as transient-absorption and time-resolved photoluminescence, have been employed to track photoexcited charge-carrier dynamics2, but their spatial resolution remains...
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Mark van Rijt (Thermo Fisher Scientific)Poster
Resonant radio frequency (RF) cavity technology has recently been introduced as a means to achieve electron pulsing and pump-probe synchronization in (S)TEM with sub-ps time resolution. Originally developed at TU Eindhoven [1,2], the design has been ported with DrX Works to the high-end TEM platform of Thermo Fisher.
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Synchronization and time delay scanning of the RF pulsed electron beam... -
Mr Nicolai-Leonid Bathen (Technion/Forschungszentrum Jülich)Poster
Understanding photoemission-driven charge dynamics at metal surfaces is important for the judicious design of electron sources and studies of ultrafast plasma formation. Following femtosecond laser excitation, transient electron clouds are formed and evolve collectively on femtosecond time scales, generating rapidly varying near-surface electric fields [1-3].
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Recently, the use of... -
Peter Baum (Universität Konstanz, Fachbereich Physik)Invited talk
All processes in materials, nanostructures and devices are on a fundamental level defined by electronic and atomic motion from initial to final conformations. Our approach for a direct, real-space visualization is pump-probe electron microscopy and diffraction with single-electron wavepackets [1] under the control of laser light [2]. The resulting few-femtosecond and attosecond time resolution...
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Michael Krueger (Technion – Israel Institute of Technology, 32000 Haifa, Israel)Invited talk
Recent advances in ultrafast science and electron microscopy are enabling unprecedented control over free electrons across a wide range of energies, spatial scales, and interaction regimes. By combining strong optical fields, nanoscale structures, and tailored electron wavepackets, it is becoming possible to probe and manipulate electron motion on its natural attosecond timescale while...
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Oh-Hoon Kwon (Korea Advanced Institute of Science and Technology)Invited talk
Controlling carrier transport in optoelectronic materials is essential for advancing device performance and scalability. So far, permanent, local structural heterogeneity has been utilized to create static energy gradients that funnel carriers. Here, we demonstrate dynamic structure–carrier coupling in a tungsten disulfide membrane. In combination of ultrafast electron microscopy and optical...
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Albert Polman (AMOLF)Poster
We present pump-probe cathodoluminescence (CL) spectroscopy using two new ultra-fast SEM instruments that we have developed in our group: one based on an electrostatic beam blanker (electron pulse duration 15 ps at 5 keV) synchronized with a 1-ns 442 nm pulsed laser, and one based on photoemission using a 500-fs 1034 nm pulsed pump laser, upconverted to 257 and 345 nm, creating 1-10 ps...
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Sven Ebel (POLIMA, University of Southern Denmark)Poster
Exciton-photon hybridization is commonly realized in geometrically defined cavities, where tuning typically requires modifying either the resonator or the excitonic medium. Here, we demonstrate experimentally that suspended subwavelength transition-metal-dichalcogenide (TMD) films support transition-radiation (TR) interference resonances that act as free-electron-defined photonic resonances...
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Prof. F. Javier García de Abajo (ICFO-Institut de Ciencies Fotoniques)Invited talk
At the intersection of electron microscopy and attosecond science, ultrafast electron microscopy has emerged as a research frontier aiming to investigate material excitations with an unprecedented combination of spatiotemporal resolution, while also granting us access to quantum phenomena involving photonic nanostructures. In this context, we will discuss the fundamental principles governing...
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