High brightness ultrafast transmission electron microscope based on a laser-driven cold-field emission source: principle and applications

Caruso, Giuseppe; Houdellier, Florent; Weber, Sébastien J.; Kociak, Mathieu; Arbouet, Arnaud

doi:10.1080/23746149.2019.1660214

Cited by 16 publications

(19 citation statements)

References 77 publications

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“…Other examples of lifetime maps on nano-diamonds are given in the supplementary materials together with more details about the fitting procedure. The high brightness of our ultrafast electron source allows to generate a 1 nm electron probe 37 . However, it is important to stress the fact that the achievable spatial resolution will depend on the studied material and targeted temporal resolution.…”

Section: C) Thanks To An Optical Fiber Coupled To the Parabolic Mirror Through A Lens (Not Shown) The Light Goes Either To A Spectrometermentioning

confidence: 99%

“…Figure 1-a,c shows a sketch of the experimental set-up ; an Hitachi HF2000 ultrafast transmission electron microscope (UTEM) equipped with an ultra-fast cold-field emission source described in previous articles [36][37][38] . A femtosecond laser generates a 400 fs pulsed electron beam from a sharp tungsten tip at a repetition rate of 2 MHz.…”

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confidence: 99%

“…The electrons are then accelerated at 150 keV. The pulsed electron beam can be focused on the sample within a probe of less than 1 nm, and scanned over the region of interest 37 . A parabolic mirror collects the cathodoluminescence generated by the interaction of the electron beam with the sample and directs it to a multimode optical fiber.…”

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confidence: 99%

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Time-resolved cathodoluminescence in an ultrafast transmission electron microscope

Meuret

Tizei

Houdellier

et al. 2021

Applied Physics Letters

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Ultrafast transmission electron microscopy (UTEM) combines sub-picosecond time-resolution with the versatility of TEM spectroscopies. It allows to study the ultrafast materials response using complementary techniques. However, until now, time-resolved cathodoluminescence was unavailable in a UTEM. In this paper we report time-resolved cathodoluminescence measurements in an ultrafast transmission electron microscope. We mapped the spatial variations of the emission dynamics from nano-diamonds with a high density of NV centers, with a 12 nm spatial resolution and sub-nanosecond temporal resolution. This development will allow to study the emission dynamics from quantum emitters with a unique spatiotemporal resolution and benefit from the wealth of complementary signals provided by transmission electron microscopes. It will further expand the possibilities of ultrafast Transmission Electron Microscopes paving the way to the investigation of the quantum aspects of electron/sample interaction.Excited states in atomic, molecular or solid-state systems can decay through a great variety of nonradiative or radiative relaxation channels. Light emission, also called luminescence, associated with radiative pathways contains invaluable information on the properties of these systems and their dynamics. Measuring the lifetime of an excited state is therefore essential to understand complex relaxation pathways. The study of light emission has motivated over the course of history a large number of major instrumental developments. The developed techniques have long relied on optical excitation of the sample 1-7

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Section: C) Thanks To An Optical Fiber Coupled To the Parabolic Mirror Through A Lens (Not Shown) The Light Goes Either To A Spectrometermentioning

confidence: 99%

mentioning

confidence: 99%

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Time-resolved cathodoluminescence in an ultrafast transmission electron microscope

Meuret

Tizei

Houdellier

et al. 2021

Applied Physics Letters

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“…Significant complexities arose during laser-UTEM implementation and image interpretation. For example, photocathode size and energy spread greatly reduced the electron beam brightness and coherence, prompting additional research in these areas [7,8]. Additionally, ultrafast laser development relies on nonlinear amplification, where frequency mixing is more effective at shorter pulse lengths (into the fs regime) and limited in repetition rate (∼100 kHz, typical), resulting in image generation times of over 15 minutes at the 1 e -/pulse limit used in some stroboscopic studies.…”

Section: Utemmentioning

confidence: 99%

Ultrafast Transmission Electron Microscopy: Techniques and Applications

2021

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Abstract:With the growing applications of temporally resolved electron microscopy for probing basic phenomena and reducing beam-induced damage, a multifaceted introduction to the field of ultrafast transmission electron microscopy is provided. This primer includes techniques and equipment as well as implementation perspectives. Historical developments and recent technical advances will provide insight into ultrafast capabilities for research as well as educate electron microscopists on the general techniques. This technology review also includes applications enabled by ultrafast techniques using various sample stimuli from multidisciplinary fields.

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“…There have been two major approaches to producing injectors of sufficiently high brightness. The first approach uses a nanotip cold field or Schottky emitter in an electron microscope column that has been modified for laser access to the cathode [14,21,22]. One can then leverage the decades of development that have been put into transmission electron microscopes with aberration corrected lenses.…”

Section: Ultra-low Emittance Injectormentioning

confidence: 99%

Challenges in simulating beam dynamics of dielectric laser acceleration

Niedermayer

Adelmann

Bettoni

et al. 2019

Int. J. Mod. Phys. A

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Dielectric Laser Acceleration (DLA) achieves the highest gradients among structure-based electron accelerators. The use of dielectrics increases the breakdown field limit, and thus the achievable gradient, by a factor of at least 10 in comparison to metals. Experimental demonstrations of DLA in 2013 led to the Accelerator on a Chip International Program (ACHIP), funded by the Gordon and Betty Moore Foundation. In ACHIP, our main goal is to build an accelerator on a silicon chip, which can accelerate electrons from below 100 keV to above 1 MeV with a gradient of at least 100 MeV/m. For stable acceleration on the chip, magnet-only focusing techniques are insufficient to compensate the strong acceleration defocusing. Thus, spatial harmonic and Alternating Phase Focusing (APF) laser-based focusing techniques have been developed. We have also developed the simplified symplectic tracking code DLAtrack6D, which makes use of the periodicity and applies only one kick per DLA cell, which is calculated by the Fourier coefficient of the synchronous spatial harmonic. Due to coupling, the Fourier coefficients of neighboring cells are not entirely independent and a field flatness optimization (similarly as in multi-cell cavities) needs to be performed. The simulation of the entire accelerator on a chip by a Particle In Cell (PIC) code is possible, but impractical for optimization purposes. Finally, we have also outlined the treatment of wake field effects in attosecond bunches in the grating within DLAtrack6D, where the wake function is computed by an external solver.

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High brightness ultrafast transmission electron microscope based on a laser-driven cold-field emission source: principle and applications

Cited by 16 publications

References 77 publications

Time-resolved cathodoluminescence in an ultrafast transmission electron microscope

Time-resolved cathodoluminescence in an ultrafast transmission electron microscope

Ultrafast Transmission Electron Microscopy: Techniques and Applications

Challenges in simulating beam dynamics of dielectric laser acceleration

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