Ultrafast transmission electron microscope for studying the dynamics of the processes induced by femtosecond laser beams

Andreev, S. V.; Aseev, S. A.; Баграташвили, В. Н.; Ищенко, А. А.; Компанец, В. О.; Malinovsky, A. L.; Миронов, Б. Н.; Тимофеев, А. А.; Чекалин, С. В.; Shashkov, E. V.; Ryabov, E. A.

doi:10.1070/qel16276

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…After the pioneering work of Zewail of Caltech and the research work of LLNL, there are some groups in the worldwide established thermal-emission TEM-based UTEM setup, such as Carbone et al at EPFL, [32,33] Flannigan et al in Minnesota, [31] Banhart et al in France, [34] Kwon et al at UNIST of Korea, [35] and other research groups at the KTH Royal Institute of Technology, Sweden, [36] and Russia. [37] These UTEMs are based on a thermionic gun (LaB 6 cathode) with a Wehnelt electrode and can be operated in the nanosecond, single-shot, femtosecond, and single/few-electron modes. The Wehnelt bias and the cathode-Wehnelt distance significantly influence the temporal and energy spreads of the picosecond electron pulses, which are determined by the spacecharge and Boersch effects, according to the number of electrons in a pulse.…”

Section: Development Of Utem At Institute Of Physicsmentioning

confidence: 99%

Ultrafast electron microscopy in material science

et al. 2018

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Recent advances in the ultrafast transmission electron microscope (UTEM), with combined spatial and temporal resolutions, have made it possible to directly visualize the atomic, electronic, and magnetic structural dynamics of materials. In this review, we highlight the recent progress of UTEM techniques and their applications to a variety of material systems. It is emphasized that numerous significant ultrafast dynamic issues in material science can be solved by the integration of the pump-probe approach with the well-developed conventional transmission electron microscopy (TEM) techniques. For instance, UTEM diffraction experiments can be performed to investigate photoinduced atomic-scale dynamics, including the chemical reactions, non-equilibrium phase transition/melting, and lattice phonon coupling. UTEM imaging methods are invaluable for studying, in real space, the elementary processes of structural and morphological changes, as well as magnetic-domain evolution in the Lorentz TEM mode, at a high magnification. UTEM electron energy-loss spectroscopic techniques allow the examination of the ultrafast valence states and electronic structure dynamics, while photoinduced near-field electron microscopy extends the capability of the UTEM to the regime of electromagnetic-field imaging with a high real space resolution.

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Section: Development Of Utem At Institute Of Physicsmentioning

confidence: 99%

Ultrafast electron microscopy in material science

et al. 2018

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“…Ultrafast science is an important aspect of modern scientific research that involves exploring the dynamic behaviors of microscopic particles 1–5 and developing strategies 6–12 to elucidate these behaviors through ultrahigh spatial and temporal resolution. This technique allows researchers to understand, apply, and control the related physics, 13–15 chemistry, 16,17 and other macroscopic phenomena 18–20 of these particles.…”

Section: Introductionmentioning

confidence: 99%

Probing electron and lattice dynamics by ultrafast electron microscopy: Principles and applications

Lian,

Sun,

Jiang

2023

Int Journal of Mech Sys Dyn

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Microscale charge and energy transfer is an ultrafast process that can determine the photoelectrochemical performance of devices. However, nonlinear and nonequilibrium properties hinder our understanding of ultrafast processes; thus, the direct imaging strategy has become an effective means to uncover ultrafast charge and energy transfer processes. Due to diffraction limits of optical imaging, the obtained optical image has insufficient spatial resolution. Therefore, electron beam imaging combined with a pulse laser showing high spatial–temporal resolution has become a popular area of research, and numerous breakthroughs have been achieved in recent years. In this review, we cover three typical ultrafast electron beam imaging techniques, namely, time‐resolved photoemission electron microscopy, scanning ultrafast electron microscopy, and ultrafast transmission electron microscopy, in addition to the principles and characteristics of these three techniques. Some outstanding results related to photon–electron interactions, charge carrier transport and relaxation, electron–lattice coupling, and lattice oscillation are also reviewed. In summary, ultrafast electron beam imaging with high spatial–temporal resolution and multidimensional imaging abilities can promote the fundamental understanding of physics, chemistry, and optics, as well as guide the development of advanced semiconductors and electronics.

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“…It can be associated with the second harmonic Eg. Quite recently, at the Institute for Spectroscopy RAS an ultrafast transmission 75-keV photoelectron microscope was created [5]. The setup is based on commercial transmission electron microscope Hitachi H-300 and is intended for the researches of dynamic processes in the solids by excitation of a sample by femtosecond laser pulses and with probing emerging 2 EPJ Web of Conferences 161, 01002 (2017) DOI: 10.1051/epjconf/201716101002 PECS-2017 dynamics using ~ 7 ps pulsed photoelectron beam.…”

mentioning

confidence: 99%

Study of ultrafast processes in matter by means of time-resolved electron diffraction and microscopy

et al. 2017

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Abstract. One of the most fundamental problems of modern natural science is the direct observation of atomic motions in the course of various processes. For this purpose, in the experiment it is necessary to provide high spatial-temporal resolution. The solution to this problem is achieved by using a pulsed electron beam of ultrashort duration to create a stroboscopic diffraction pattern in the method of time-resolved electron diffraction (TRED). Three types of experimental schemes have been developed at our lab. The experimental complex includes (i) 20-keV table-top apparatus for TRED, (ii) 75-keV ultrafast transmission electron microscope and (iii) lensless table-top device for femtosecond electron diffraction. The obtained experimental results are presented.At present, the study of the structural dynamics of matter with a high spatially-temporal resolution is one of the key topics of modern researches. It is of undoubted interest for condensed matter physics, molecular and chemical physics, biophysics, and materials science [1][2][3]. Now ultrafast electron microscopy and electron diffraction are rapidly developing fields. These methods are based on probing coherent laser-induced processes in various materials using photoelectron bunches. This approach allows one to supplement the high temporal resolution provided by femtosecond lasers with the atomic spatial resolution, inherent in electron diffraction technique. As a result, one can make a video of the behavior of matter matched in 4D space -time continuum.The first direct observation of the generation of coherent optical phonons in thin Sb film by TRED has been done using the experimental scheme, depicted in Fig. 1 [3]. The semimetal sample was excited by a femtosecond laser pulse and probed with a pulsed photoelectron beam. The vibrational modes of Sb lattice have two optical A1g and Eg modes and two lowfrequency A1u and Eu acoustic modes. The fundamental of a femtosecond Ti:Sa laser was used as the pump beam. The pulsed photoelectron beam was formed under the irradiation of * Corresponding author: chekalin@isan.troitsk.ru

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Ultrafast transmission electron microscope for studying the dynamics of the processes induced by femtosecond laser beams

Cited by 14 publications

References 3 publications

Ultrafast electron microscopy in material science

Ultrafast electron microscopy in material science

Probing electron and lattice dynamics by ultrafast electron microscopy: Principles and applications

Study of ultrafast processes in matter by means of time-resolved electron diffraction and microscopy

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