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Anisotropic propagation imaging of elastic waves in oriented columnar thin films

hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
dc.contributor.authorCOFFY, E
hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
dc.contributor.authorDODANE, Guillaume
hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
dc.contributor.authorEUPHRASIE, Sébastien
hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
dc.contributor.authorMOSSET, A.
hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
dc.contributor.authorVAIRAC, Pascal
hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
dc.contributor.authorMARTIN, N.
hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorBAIDA, H.
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorRAMPNOUX, Jean-Michel
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorDILHAIRE, Stefan
dc.date.created2017-07-26
dc.date.issued2017
dc.identifier.issn0022-3727
dc.description.abstractEnWe report on the observation of strongly anisotropic surface acoustic wave propagation on nanostructured thin films. Two kinds of tungsten samples were prepared by sputtering on a silicon substrate: a conventional thin film with columns normal to the substrate surface, and an oriented columnar architecture using the glancing angle deposition (GLAD) process. Pseudo-Rayleigh waves (PRWs) were imaged as a function of time in x and y directions for both films thanks to a femtosecond heterodyne pump-probe setup. A strong anisotropic propagation as well as a high velocity reduction of the PRWs were exhibited for the GLAD sample. For the wavevector k /2 π = 3 × 10 5 m −1 the measured group velocities v x and v y equal 2220 m s −1 for the sample prepared with conventional sputtering, whereas a strong anisotropy appears ( v x = 1600 m s −1 and v y = 870 m s −1 ) for the sample prepared with the GLAD process. Using the finite element method, the anisotropy is related to the structural anisotropy of the thin film’s architecture. The drop of PRWs group velocities is mainly assigned to the porous microstructure, especially favored by atomic shadowing effects which appear during the growth of the inclined columns. Such GLAD thin films constitute a new tool for the control of the propagation of surface elastic waves and for the design of new devices with useful properties.
dc.description.sponsorshipSystèmes intelligents intégrés au cœur de la matière - ANR-11-LABX-0001
dc.description.sponsorshipPHENOMENES ET METROLOGIE TERMIQUES FEMTOSECONDES - ANR-10-NANO-0014
dc.language.isoen
dc.publisherIOP Publishing
dc.rights.urihttp://creativecommons.org/licenses/by-sa/
dc.subject.enAnisotropy
dc.subject.enPump-probe setup
dc.subject.enAcoustics
dc.subject.enGlancing angle deposition GLAD
dc.subject.enColumnar films
dc.title.enAnisotropic propagation imaging of elastic waves in oriented columnar thin films
dc.typeArticle de revue
dc.identifier.doi10.1088/1361-6463/aa92ad
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
dc.subject.halPhysique [physics]/Mécanique [physics]/Acoustique [physics.class-ph]
bordeaux.journalJournal of Physics D: Applied Physics
bordeaux.page484005
bordeaux.volume50
bordeaux.issue48
bordeaux.peerReviewedoui
hal.identifierhal-01657426
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01657426v1
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