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• W3211456502 abstract "Imaging photo-induced ultrafast dynamics of nanostructure phase transition is of great interest to the fields of laser-matter interactions and nanotechnology. However, conventional ultrafast far-field optical imaging methods cannot image nanostructures as their scattering scales as D 6 , with D being the diamater, leading to a vanishing signal-to-noise ratio. Here, we use ultrafast ultramicroscopy to capture the spatiotemporal evolution of surface nanostructures as they undergo melting, spallation, and re-solidification processes. Our experimental observations, combined with finite difference time domain (FDTD) simulations, show agreement with molecular dynamic simulations on ultrashort laser pulse-irradiated metallic nanoparticles and suggest the occurrence of melting of nanostructures followed by photomechanical spallation within a few picoseconds. At longer timescales, we image the re-solidification dynamics of the melted nanostructures occurring within nanoseconds. The re-solidification time for nanostructured surface occurs an order of magnitude faster than for an initially flat surface. Our study demonstrates a simple but powerful far-field optical approach for studying ultrafast dynamics of nanostructures. • Introducing an optical far-field ultrafast imaging method for nanostructures • Imaging photomechanical spallation of nanostructures within picoseconds • Imaging the re-solidification dynamics of nanostructures Ultrafast imaging of nanostructures is challenging due to their low signal-to-noise-ratio. ElKabbash et al. use ultrafast ultramicroscopy to image light-matter interactions at the nanoscale, spatial, and femtosecond scale temporally. The results show that irradiating surface nanostructures with an intense femtosecond laser pulse undergo photomechanical spallation within a few picoseconds." @default.
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• W3211456502 date "2021-12-01" @default.
• W3211456502 modified "2023-10-14" @default.
• W3211456502 title "Imaging nanostructure phase transition through ultrafast far-field optical ultramicroscopy" @default.
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• W3211456502 doi "https://doi.org/10.1016/j.xcrp.2021.100651" @default.
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