| Autor: |
Mohamed ElKabbash, Ranran Fang, Anatoliy Vorobyev, Sohail A. Jalil, Sandeep Chamoli, Billy Lam, Subhash Singh, Chunlei Guo |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Cell Reports Physical Science, Vol 2, Iss 12, Pp 100651- (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2666-3864 |
| DOI: |
10.1016/j.xcrp.2021.100651 |
| Popis: |
Summary: 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 D6, 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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