Micromosaic formation in laser-irradiated Si probed by picosecond time-resolved x-ray diffraction
| Autor: | Yasuhisa H. Okano, Kazutaka G. Nakamura, Hiroto Morishita, Ken-ichi Kondo, Yoichiro Hironaka, Hiroaki Kishimura, Toshiyuki Atou |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Physical Review B. 74 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.74.224301 |
| Popis: | The transient lattice behavior of single-crystal Si(111) under $300\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$ laser irradiation has been observed by time-resolved x-ray diffraction. At first, the rocking curves of the laser-irradiated Si(111) have a higher-angle-shifted component. The higher-angle component is attributed to lattice compression, which is induced by laser ablation. The maximum lattice strain is estimated at 5.6%, which is larger than the Hugoniot elastic limit for Si(111). After $1000\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$, a broadening of the main peak was recorded. In addition, the rocking curve of a recovered sample is clearly broader than that of a pristine sample. Reciprocal space mapping for the recovered sample shows that the lattice spacing of the recovered sample does not change from that of the pristine sample, whereas lattice planes are misoriented. The results of time-resolved measurement and the assessment of the recovered sample indicate that mosaic blocks with inclined orientations are induced by laser-driven elastic compression and the subsequent pressure release, rather than plastic deformation. |
| Databáze: | OpenAIRE |
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