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Benefitting from high field enhancement and great stability of carbon nanotubes, ultrafast photoemission from carbon nanotubes emitter excited by a 410 nm femtosecond laser has been realized in the field‐driven regime with 0.25 eV energy spread, as described by Qing Dai and co‐workers in article number 1701580. These results pave the way toward electron microscopy with ultimate spatio‐temporal resolution...
Ultrafast electron pulses, combined with laser‐pump and electron‐probe technologies, allow ultrafast dynamics to be characterized in materials. However, the pursuit of simultaneous ultimate spatial and temporal resolution of microscopy and spectroscopy is largely subdued by the low monochromaticity of the electron pulses and their poor phase synchronization to the optical excitation pulses. Field‐driven...
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