Yangtze River Delta G60 Laser Alliance Introduction
HD1University of Vienna and the University of Shiigen have demonstrated a disruptive technology that they found that new technologies combining electron microscopy and laser technology make the programmable electron beam arbitrarily possible. It can potentially be used to optimize electron optical and adaptive electron microscopy, maximizing sensitivity while minimizing damage caused by beams. The results were published in the magazine PRX.
When light passes through turbulent or dense matter, such as the Earth's atmosphere or a millimeter thick tissue, standard imaging techniques are greatly limited in imaging quality. Therefore, scientists placed the deforming mirror in the optical path of the telescope or microscope, thus offsetting the undesirable impact. This so-called adaptive optics has made many breakthroughs in astronomy and deep tissue imaging.
Recent experiments from the University of Vienna show that light (red) can be used in electron beams of any shape (yellow), opening up new possibilities for electron microscopy and metrology.
However, although electronic optics are required in many applications in materials science and structural biology, electronic optics has not reached this level of control. In electron optics, scientists use electron beams instead of light to image structures with atoms and resolution. Typically, static electromagnetic fields are used to control and focus electron beams.
Experimental device: Programmable qualitative motion deflection of electrons in free space.
In a new study published on PRX, researchers from the University of Vienna (School of Physics and the Max Perutz Laboratory) and the University of Shiigen now show that using high-intensity, shaped light fields that repel electrons can deflect electrons almost at will. In 1933, Kapitza and Dirac first predicted this effect, and with the emergence of high-intensity pulsed lasers, the first experiment proved (Bucksbaum et al., 1988, Freimund et al., 2001).
Vienna experiments now take advantage of this ability to shape light. In the improved scanning electron microscope , the laser pulse is shaped by the spatial light modulator and interacts with the back-propagated synchronous pulse electron beam. This enables the lateral phase shift of electron wave to be imprinted as needed, thereby achieving unprecedented control of the electron beam.
mass-motivation electron-light interaction.
demonstrates the potential of this innovative technology by creating convex and concave electron lenses and generating complex electron intensity distributions. As Marius Constantin Chirita Mihaila, the lead author of the study, pointed out: "We wrote on the transverse phase of the electron wave with a laser beam. Our experiment paves the way for wavefront shaping of pulsed electron microscopes with thousands of programmable pixels. In the future, some parts of the electron microscope may be made of light."
CMOS ( scale bar 33 μm) before delignization (5×) to IP.
Compared with other competitive electronic forming techniques, this solution is programmable and avoids instability caused by loss, inelastic scattering and degradation of material diffraction elements. "Our plastic surgery technology allows aberration correction and adaptive imaging in pulsed electron microscopes. It can be used to adjust the microscope to adapt to the specimens studied, thereby maximizing sensitivity."
Source: Transverse Electron-Beam Shaping with Light, PHYSICAL REVIEW X, 10.1103/PhysRevX.12.031043
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