Picosecond ultrasonic investigations of phonons in 2D nano-scaled lattices
| Autor: | Jean-François Robillard, I. Roch-Jeune, Arnaud Devos |
|---|---|
| Přispěvatelé: | 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: | 2007 |
| Předmět: |
History
Materials science Phonon business.industry 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Laser 01 natural sciences Molecular physics Computer Science Applications Education law.invention Optics law Dispersion relation Picosecond Lattice (order) 0103 physical sciences Femtosecond Nano Ultrasonic sensor 010306 general physics 0210 nano-technology business |
| Zdroj: | Journal of Physics: Conference Series Journal of Physics: Conference Series, IOP Publishing, 2007, 92, pp.012027-1-4. ⟨10.1088/1742-6596/92/1/012027⟩ Journal of Physics: Conference Series, 2007, 92, pp.012027-1-4. ⟨10.1088/1742-6596/92/1/012027⟩ |
| ISSN: | 1742-6588 1742-6596 |
| DOI: | 10.1088/1742-6596/92/1/012027⟩ |
| Popis: | We time-resolved the acoustical response of lattices of aluminum nano-dots with a step of a few hundreds nanometers using tunable femtosecond laser pulses in a pump and probe scheme. We detected two kinds of modes, the first being the individual modes of the dots. The other modes are shown to be both dependent on the dot size and on the lattice and are thus interpreted as collective modes. Using several step sizes we show that we can plot the phonon dispersion relation. A simple analytical model very well reproduces the data from which we can describe completely the dependence of the lattice modes on the sample parameters. |
| Databáze: | OpenAIRE |
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