A5065452596- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Photonic and Optical Devices
- Quantum Dots Synthesis And Properties
- Electronic and Structural Properties of Oxides
- Analytical Chemistry and Sensors
- Diamond and Carbon-based Materials Research
- Chalcogenide Semiconductor Thin Films
- Photonic Crystals and Applications
- Advanced Fluorescence Microscopy Techniques
- Water Quality Monitoring and Analysis
- Photoacoustic and Ultrasonic Imaging
- Photocathodes and Microchannel Plates
- Optical Coatings and Gratings
- 2D Materials and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Nonlinear Optical Materials Studies
- Integrated Circuits and Semiconductor Failure Analysis
- Force Microscopy Techniques and Applications
- Electrochemical Analysis and Applications
- CCD and CMOS Imaging Sensors
- Atomic and Subatomic Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Molecular Junctions and Nanostructures
Centre National de la Recherche Scientifique
2020-2025
Laboratoire de physique des Solides
2020-2025
Université Paris-Saclay
2021-2025
Universidade Estadual de Campinas (UNICAMP)
2017-2022
Czech Academy of Sciences, Institute of Physics
2020
Pontifícia Universidade Católica de Campinas
2020
Institute of Applied Physics
2020
Université Paris-Sud
2020
Universidade de São Paulo
2015
Following the lifespan of optical excitations from their creation to decay into photons is crucial in understanding materials properties. Macroscopically, techniques such as photoluminescence excitation spectroscopy provide unique information on photophysics with applications diverse quantum optics or photovoltaics. Materials and emission pathways are affected by nanometer scale variations directly impacting devices performances. However, they cannot be accessed, despite techniques,...
The synergy between free electrons and light has recently been leveraged to reach an impressive degree of simultaneous spatial spectral resolution, enabling applications in microscopy quantum optics. However, the required combination electron optics injection into spectrally narrow modes arbitrary specimens remains a challenge. Here, we demonstrate microelectronvolt resolution with sub-nanometer probe photonic quality factors as high 104. We rely on mode matching tightly focused laser beam...
We report on the design, realization, and experimental investigation by spatially resolved monochromated electron energy loss spectroscopy (EELS) of high-quality-factor cavities with modal volumes smaller than λ3, λ being free-space wavelength light. The are based a slot defect in 2D photonic crystal slab made up silicon. They optimized for high coupling electrons accelerated to 100 kV quasi-transverse electrical modes polarized along direction. studied two geometries took advantage deep...
Thermal transport in nanostructures plays a critical role modern technologies. As devices shrink, techniques that can measure thermal properties at nanometer and nanosecond scales are increasingly needed to capture transient, out-of-equilibrium phenomena. We present novel pump–probe photon–electron method within scanning transmission electron microscope (STEM) map temperature dynamics with unprecedented spatial temporal resolutions. By combining focused laser-induced heating synchronized...
Abstract This conference proceeding reports on the usage and applications of a high numerical aperture mirror for cathodoluminescence other photon-based spectroscopies in scanning transmission electron microscope.
Whispering-gallery mode resonators host multiple trapped narrow-band circulating optical resonances that find applications in quantum electrodynamics, optomechanics, and sensing. However, the spherical symmetry low field leakage of dielectric microspheres make it difficult to probe their high-quality modes using far-field radiation. Even so, local enhancement from metallic nanoparticles (MNPs) coupled can interface far bounded cavity modes. In this work, we study interaction between...
We have studied the excitonic properties of exfoliated tungsten diselenide (WSe$_2$) monolayers transferred to gold substrates using tunneling current in a Scanning Tunneling Microscope (STM) operated air excite light emission locally. In obtained spectra, energies are independent applied bias voltage and resemble photoluminescence (PL) results, indicating that, both cases, is due neutral charged exciton recombination. Interestingly, electron injection rate, that is, current, can be used...
We present the design, implementation, and illustrative results of a light collection/injection strategy based on an off-axis parabolic mirror collector for low-temperature Scanning Tunneling Microscope (STM). This device allows us to perform STM induced Light Emission (STM-LE) Cathodoluminescence (STM-CL) experiments in situ Photoluminescence (PL) Raman spectroscopy as complementary techniques. Considering Étendue conservation using mirror, it is possible design collection injection system...
Electron-photon temporal correlations in electron energy loss (EELS) and cathodoluminescence (CL) spectroscopies have recently been used to measure the relative quantum efficiency of materials. This combined spectroscopy, named Cathodoluminescence excitation spectroscopy (CLE), allows identification decay channels which are hidden average measurements. Here, we demonstrate that CLE can also be excitation's time. In addition, time as a function is accessed, for each electron-photon pair...
Electron–photon temporal correlations in electron energy loss spectroscopy (EELS) and cathodoluminescence (CL) spectroscopies have recently been used to measure the relative quantum efficiency of materials. This combined spectroscopy, named excitation (CLE) allows for identification decay channels, which are hidden average measurements. Here, we demonstrate that CLE can also be excitations' time. In addition, time as a function is measured, each electron–photon pair probed. We two well-known...
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Thermal transport in nanostructures plays a critical role modern technologies. As devices shrink, techniques that can measure thermal properties at nanometer and nanosecond scales are increasingly needed to capture transient, out-of-equilibrium phenomena. We present novel pump-probe photon-electron method within scanning transmission electron microscope (STEM) map temperature dynamics with unprecedented spatial temporal resolutions. By combining focused laser-induced heating synchronized...
We report on the design, realization and experimental investigation by spatially resolved monochromated electron energy loss spectroscopy (EELS) of high quality factor cavities with modal volumes smaller than $\lambda^3$, $\lambda$ free-space wavelength light. The are based a slot defect in 2D photonic crystal slab made up silicon. They optimized for coupling electrons accelerated to 100 kV, quasi-Transverse Electrical modes polarized along direction. studied two geometries. first geometry,...
Ultra-fast transmission electron microscopy (UTEM) combines sub-picosecond time-resolution with the versatility of TEM spectroscopies. It allows one to study dynamics materials properties combining complementary techniques. However, until now, time-resolved cathodoluminescence, which is expected give access optical dynamics, was still unavailable in a UTEM. In this paper, we report cathodoluminescence measurements an ultrafast microscope. We measured lifetime maps, 12 nm spatial resolution...
A microscopia de varredura tunelamento utiliza uma ponta metálica aguda próxima da superfície que quer se observar para a probabilidade elétrons seja alta o suficiente haver corrente na metálica. emissão luz ocorre com ocupação estados desocupados pelos tunelamento. Esta emitida é refletida ajuda um espelho parabólico fibra óptica, por sua vez funciona como guia onda levar ao espectrômetro, e posteriormente em câmera CCD. Neste projeto foi trabalhada sincronia entre movimento do STM...
O presente projeto busca desenvolver um Microscópio Confocal que deverá ser utilizado em conjunto com Eletrônico de Varredura para encontrar e analisar, maneira rápida eficiente, regiões interesse semicondutores nanoestruturados suas propriedades.
Following the lifespan of optical excitations from their creation to decay into photons is crucial in understanding materials properties. Macroscopically, techniques such as photoluminescence excitation spectroscopy provide unique information on photophysics with applications diverse quantum optics or photovoltaics. Materials and emission pathways are affected by nanometer scale variations directly impacting devices performances. However, they cannot be accessed, despite techniques,...