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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Yonggang Shen Yong Gan |
| Copyright Year | 2011 |
| Description | Author affiliation: Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China (Yong Gan) || Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China (Yonggang Shen) |
| Abstract | Femtosecond pulse laser heating of a germanium nanofilm is simulated by a method coupling the molecular dynamics and an energy transfer model for ultrafast laser interaction with semiconductors. Simulations demonstrate that the carrier temperature and density drastically evolve at the early heating time, while the lattice temperature gradually rises until the carrier-lattice thermal equilibrium is reached. The surface reflectivity dynamically changes as the carrier density evolves. The femtosecond laser heating can cause a strong thermal stress wave in the film. Initially, a compressive wave is yielded with the peak compression near the irradiated surface. Then, the compression wave transforms into a two-fold wave including compression and tension. At the rear film side, a strong tensile wave occurs with the maximum tension near the back surface. It is also found that shorter laser wavelength brings not only higher carrier temperature and density but also higher lattice temperature and larger thermal stresses. |
| Starting Page | 150 |
| Ending Page | 153 |
| File Size | 240577 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781467310758 |
| e-ISBN | 9781467310789 |
| DOI | 10.1109/SPAWDA.2011.6167214 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-12-09 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Numerical modeling Ultrashort pulse lasers Semiconductor Films Lattices Surface emitting lasers Laser modes Germanium Laser-matter interaction |
| Content Type | Text |
| Resource Type | Article |
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