Individual and collective vibrational modes of nanostructures studied by picosecond ultrasonics
| Autor: | Jean-François Robillard, Bernard Perrin, Laurent Belliard, Arnaud Devos, I. Roch-Jeune, T. Bienville |
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| Přispěvatelé: | Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF) |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Vibration mode
Materials science Acoustics and Ultrasonics 02 engineering and technology Radiation Dosage 01 natural sciences Molecular physics Vibration Crystal Condensed Matter::Materials Science [SPI]Engineering Sciences [physics] Optics Normal mode 0103 physical sciences Materials Testing Physics::Atomic and Molecular Clusters Computer Simulation Ultrasonics 010306 general physics Electronic band structure Radiometry Coupling business.industry Lasers Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Elasticity Picosecond laser ultrasonic Nanostructures Models Chemical Picosecond Molecular vibration Picosecond ultrasonics 0210 nano-technology business Algorithms |
| Zdroj: | Ultrasonics Ultrasonics, 2006, 44, pp.1289-1294 Ultrasonics, Elsevier, 2006, 44, pp.1289-1294 Proceedings of the 2005 World Congress on Ultrasonics 2005, ThDpm1-08 HAL |
| ISSN: | 0041-624X |
| Popis: | International audience; We report on picosecond ultrasonic measurements obtained on aluminum and platinum nanostructures with variable dot size and lateral periodicity which realized a 2D phononic crystal. Performing investigations at different resolution scales, we have identified individual modes of vibration depending on the dot size, and mode of vibration strongly correlated with the bi-dimensional organization. The platinum dots sputtered on an aluminum layer have shown a behavior of isolated oscillators without any coupling between neighbor elements in this phononic crystal. The frequency of such normal modes, extracted from time resolved measurements are in good agreement with 3D finite element simulations. In contrast, with aluminum dot systems where the coupling is more efficient we observe a complex spectrum of vibrational modes related to the band structure induced by the bi-dimensional patterning. |
| Databáze: | OpenAIRE |
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