Publications (41)
Excitation's lifetime extracted from electron-photon (EELS-CL) nanosecond-scale temporal coincidences
Nadezda Varkentina, Yves Auad, Steffi Y. Woo +9
Electron-photon temporal correlations in electron energy loss (EELS) and cathodoluminescence (CL) spectroscopies have recently been used to measure the relative quantum efficiency…
eV electron spectromicroscopy using free-space light
Yves Auad, Eduardo J. C. Dias, Marcel Tencé +7
The synergy between free electrons and light has recently been leveraged to reach an impressive degree of simultaneous spatial and spectral resolution, enabling applications in mic…
Quantum Confined Luminescence in Two dimensions
Saiphaneendra Bachu, Fatimah Habis, Benjamin Huet +13
Achieving localized light emission from monolayer two-dimensional (2D) transition metal dichalcogenides (TMDs) embedded in the matrix of another TMD has been theoretically proposed…
Three dimensional vectorial imaging of surface phonons
Xiaoyan Li, Georg Haberfehlner, Ulrich Hohenester +3
While phonons and their related properties have been studied comprehensively in bulk materials, a thorough understanding of surface phonons for nanoscale objects remains elusive. I…
High efficiency coupling of free electrons to sub- modal volume, high-Q photonic cavities
Malo Bézard, Imène Si Hadj Mohand, Luigi Ruggierio +6
We report on the design, realization and experimental investigation by spatially resolved monochromated electron energy loss spectroscopy (EELS) of high quality factor cavities wit…
Can Copper Nanostructures Sustain High-Quality Plasmons?
Vahagn Mkhitaryan, Katia March, Eric Tseng +10
Silver is considered to be the king among plasmonic materials because it features low inelastic absorption in the visible and infrared (vis-IR) spectral regions compared to other m…
Electron Beam Spectroscopy for Nanophotonics
Albert Polman, Mathieu Kociak, F. Javier GarcÃa de Abajo
Progress in electron-beam spectroscopies has recently enabled the study of optical excitations with combined space, energy and time resolution in the nanometer, millielectronvolt a…
Probing Quantum Optical Excitations with Fast Electrons
Valerio Di Giulio, Mathieu Kociak, F. Javier GarcÃa de Abajo
Probing optical excitations with nanometer resolution is important for understanding their dynamics and interactions down to the atomic scale. Electron microscopes currently offer…
Bridging nano-optics and condensed matter formalisms in a unified description of inelastic scattering of relativistic electron beams
Hugo Lourenço-Martins, Axel Lubk, Mathieu Kociak
In the last decades, the blossoming of experimental breakthroughs in the domain of electron energy loss spectroscopy (EELS) has triggered a variety of theoretical developments. Tho…
Cathodoluminescence excitation spectroscopy: nanoscale imaging of excitation pathways
Nadezda Varkentina, Yves Auad, Steffi Y. Woo +9
Following the lifespan of optical excitations from their creation to decay into photons is crucial in understanding materials optical properties. Macroscopically, techniques such a…
Cathodoluminescence, light injection and EELS in STEM: From comparative to coincidence experiments
Luiz H. G. Tizei, Yves Auad, Florian Castioni +1
Electron spectroscopy implemented in electron microscopes provides high spatial resolution, down to the atomic scale, of the chemical, electronic, vibrational and optical propertie…
Optical absorption in hexagonal-diamond Si and Ge nanowires: insights from STEM-EELS experiments and ab initio theory
Luiz H. G. Tizei, Michele Re Fiorentin, Thomas Dursap +6
Hexagonal-diamond (2H) group IV nanowires are key for advancing group IV-based lasers, quantum electronics, and photonics. Understanding their dielectric response is crucial for pe…
Nanometer Scale Spectral Imaging of Quantum Emitters in Nanowires and Its Correlation to Their Atomically Resolved Structure
Luiz Fernando Zagonel, Stefano Mazzucco, Marcel Tencé +9
We report the spectral imaging in the UV to visible range with nanometer scale resolution of closely packed GaN/AlN quantum disks in individual nanowires using an improved custom-m…
Event-based hyperspectral EELS: towards nanosecond temporal resolution
Yves Auad, Michael Walls, Jean-Denis Blazit +5
The acquisition of a hyperspectral image is nowadays a standard technique used in the scanning transmission electron microscope. It relates the spatial position of the electron pro…
Nanosecond nanothermometry in an electron microscope
Florian Castioni, Yves Auad, Jean-Denis Blazit +8
Thermal transport in nanostructures plays a critical role in modern technologies. As devices shrink, techniques that can measure thermal properties at nanometer and nanosecond scal…
Local Optical Chirality Induced by Near-Field Mode Interference in Achiral Plasmonic Metamolecules
Andreas Horrer, Yinping Zhang, Davy Gérard +4
When circularly polarized light interacts with a nanostructure, the optical response depends on the geometry of the structure. If the nanostructure is chiral (i.e., it cannot be su…
Visualizing plasmon-exciton polaritons at the nanoscale using electron microscopy
Andrew B. Yankovich, Battulga Munkhbat, Denis G. Baranov +7
Polaritons are compositional light-matter quasiparticles that have recently enabled remarkable breakthroughs in quantum and nonlinear optics, as well as in material science. Despit…
Vibrational surface EELS probes confined Fuchs-Kliewer modes
Hugo Lourenço-Martins, Mathieu Kociak
Recently, two reports have demonstrated the amazing possibility to probe vibrational excitations from nanoparticles with a spatial resolution much smaller than the corresponding fr…
Spectroscopies and electron microscopies unravel the origin of the first colour photographs
Victor de Seauve, Marie-Angélique Languille, Mathieu Kociak +7
The first colours photographs were created by a process introduced by Edmond Becquerel in 1848. The nature of these photochromatic images colours motivated a debate between scienti…
Excitons and stacking order in h-BN
Romain Bourrellier, Michele Amato, Luiz Henrique Galvão Tizei +8
The strong excitonic emission at 5.75 eV of hexagonal boron nitride (h-BN) makes this material one of the most promising candidate for light emitting devices in the far ultraviolet…
Single photon emitters in hBN: Limitations of atomic resolution imaging and potential sources of error
David Lamprecht, Shrirang Chokappa, Alissa M. Freilinger +9
There is a growing interest in identifying the origin of single-photon emission in hexagonal boron nitride (hBN), with proposed candidates including boron and nitrogen vacancies as…
Point defect states emergence in a plasmonic crystal
Hikaru Saito, Hugo Lourenço-Martins, Noémie Bonnet +6
Plasmonic crystals are well known to have band structure including a bandgap, enabling the control of surface plasmon propagation and confinement. The band dispersion relation of b…
Atomic Configuration of Nitrogen Doped Single-Walled Carbon Nanotubes
Raul Arenal, Katia March, Chris P. Ewels +4
Having access to the chemical environment at the atomic level of a dopant in a nanostructure is crucial for the understanding of its properties. We have performed atomically-resolv…
Unveiling the coupling of single metallic nanoparticles to whispering-gallery microcavities
Yves Auad, Cyrille Hamon, Marcel Tencé +6
Whispering-gallery mode resonators host multiple trapped narrowband circulating optical resonances that find applications in quantum electrodynamics, optomechanics, and sensing. Ho…
Engineering 2D material exciton lineshape with graphene/h-BN encapsulation
Steffi Y. Woo, Fuhui Shao, Ashish Arora +20
Control over the optical properties of atomically thin two-dimensional (2D) layers, including those of transition metal dichalcogenides (TMDs), is needed for future optoelectronic…
Roadmap for Quantum Nanophotonics with Free Electrons
F. Javier GarcÃa de Abajo, Albert Polman, Cruz I. Velasco +44
Over the past century, continuous advancements in electron microscopy have enabled the synthesis, control, and characterization of high-quality free-electron beams. These probes ca…
Nanoscale modification of WS trion emission by its local electromagnetic environment
Noémie Bonnet, Hae Yeon Lee, Fuhui Shao +9
Structural, electronic, and chemical nanoscale modifications of transition metal dichalcogenide monolayers alter their optical properties, including the generation of single photon…
Cubic BN optical gap and intragap optically active defects
Anna Tararan, Stefano di Sabatino, Matteo Gatti +6
We report a comprehensive study on the optical properties of cubic boron nitride (c-BN) and its optically active defects. Using electron energy-loss spectroscopy (EELS) within a mo…
Plasmon-interband hybridization and anomalous production of hot electrons in aluminum nanoantennas
Jérôme Martin, Oscar Avalos-Ovando, Thomas Simon +9
Strong coupling typically occurs between two separate objects or between an object and its environment (such as an atom and a cavity). However, it can also occur between two differ…
Probing the symmetry of the potential of localized surface plasmon resonances with phase-shaped electron beams
Giulio Guzzinati, Armand Béché, Hugo Lourenço--Martins +3
Plasmonics, the science and technology of the interaction of light with metallic objects, is fundamentally changing the way we can detect, generate and manipulate light. Although t…
Optical polarization analogue in free electrons beams
Hugo Lourenço-Martins, Davy Gérard, Mathieu Kociak
Fast electrons spectromicroscopies enable to measure quantitatively the optical response of excitations with unrivaled spatial resolution. However, due to their inherently scalar n…
Advancing Time-Resolved Spectroscopies with Custom Scanning Units and Event-Based Electron Detection
Yves Auad, Florian Castioni, Jassem Baaboura +9
Direct electron detection is revolutionizing electron microscopy by offering lower noise, reduced point-spread function, and increased quantum efficiency. Among these advancements,…
Tomographic reconstruction of quasistatic surface polariton fields
Raphael Hauer, Georg Haberfehlner, Gerald Kothleitner +2
We theoretically investigate the tomographic reconstruction of the three-dimensional photonic environment of nanoparticles. As input for our reconstruction we use electron energy l…
Aluminum Cayley trees as scalable, broadband, multi-resonant optical antennas
Thomas Simon, Xiaoyan Li, Jérôme Martin +4
An optical antenna can convert a propagative optical radiation into a localized excitation, and reciprocally. Although optical antennas can be readily created using resonant nanopa…
Time calibration studies for the Timepix3 hybrid pixel detector in electron microscopy
Yves Auad, Jassem Baaboura, Jean-Denis Blazit +4
Direct electron detection is currently revolutionizing many fields of electron microscopy due to its lower noise, its reduced point-spread function, and its increased quantum effic…
Design and implementation of a device based on an off-axis parabolic mirror to perform luminescence experiments in a scanning tunneling microscope
Ricardo Javier Peña Román, Yves Auad, Lucas Grasso +5
We present the design, implementation, and illustrative results of a light collection/injection strategy based on an off-axis parabolic mirror collector for a low-temperature Scann…
Tailored nanoscale plasmon-enhanced vibrational electron spectroscopy
Luiz H. G. Tizei, Vahagn Mkhitaryan, Hugo Lourenço-Martins +12
Vibrational optical spectroscopies can be enhanced by surface plasmons to reach molecular-sized limits of detection and characterization. The level of enhancement strongly depends…
Spatial and spectral dynamics in STEM hyperspectral imaging using random scan patterns
Alberto Zobelli, Steffi Y. Woo, Luiz H. G. Tizei +6
The evolution of the scanning modules for scanning transmission electron microscopes (STEM) has realized the possibility to generate arbitrary scan pathways, an approach currently…
Selective probing of longitudinal and transverse plasmon modes with electron phase-matching
Franck Aguilar, Hugo Lourenço-Martins, Damián Montero +3
The optical properties of metallic nanoparticles are dominated by localized surface plasmons (LSPs). Their properties only depend on the constituting material, the size and shape o…
Development of a high brightness ultrafast Transmission Electron Microscope based on a laser-driven cold field emission source
Florent Houdellier, Giuseppe M. Caruso, Sébastien Weber +2
We report on the development of an ultrafast Transmission Electron Microscope based on a cold field emission source which can operate in either DC or ultrafast mode. Electron emiss…
Absolute measurement of the intrinsic helicity in nanophotonics
Malo Bézard, Simon Garrigou, Jérémie Béal +5
Helicity is a universal quantity describing the internal rotation of an object or a field. Whether it characterizes fundamental properties such as the spin of elementary particles…