Dependence of fast electron characteristics on the thickness of the nanocrystalline film target in intense, ultrashort laser–solid interaction
| Autor: | Yash M. Ved, G. Ravindra Kumar, Moniruzzaman Shaikh, Pushan Ayyub, Kamalesh Jana, Amitava Adak, Indranuj Dey, Subhrangsu Sarkar, Amit D. Lad, Deep Sarkar |
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| Rok vydání: | 2020 |
| Předmět: |
Length scale
Materials science Physics and Astronomy (miscellaneous) business.industry General Engineering General Physics and Astronomy Electron Dielectric engineering.material Laser 01 natural sciences Nanocrystalline material law.invention 010309 optics Coating law 0103 physical sciences Femtosecond engineering Optoelectronics Electron temperature 010306 general physics business |
| Zdroj: | Applied Physics B. 126 |
| ISSN: | 1432-0649 0946-2171 |
| Popis: | We demonstrate an interesting modulation of fast electron temperature and yield as a function of the thickness of nanocrystalline coating on a dielectric target, in femtosecond, intense laser interaction with a solid target. We measure the fast electron energy spectrum for fused silica targets coated with ultrathin, nanocrystalline Cu films with thickness ranging from 30 to 100 nm and compare them with those from a planar, uncoated polished silica surface. The fast electron temperature exhibits an unexpected dependence on the film thickness, peaking at 30 and 45 nm and falling off for films with higher thicknesses. During these experiments, the size of the Cu nanograins was kept constant and only the film thickness was varied. We find that—in the low thickness limit—the target thickness acts as an additional length scale, independent of the surface topography, and needs to be separately optimized for maximizing the generation of fast electrons from high-intensity, ultrashort laser–matter interaction. |
| Databáze: | OpenAIRE |
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