Acoustic phonon propagation in ultra-thin Si membranes under biaxial stress field
Graczykowski, Bartlomiej (Institut Català de Nanociència i Nanotecnologia)
Gomis-Bresco, Jordi (Institut Català de Nanociència i Nanotecnologia)
Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia)
Reparaz, Juan Sebastian (Institut Català de Nanociència i Nanotecnologia)
Shchepetov, Andrey (VTT Technical Research Centre of Finland)
Prunnila, Mika (VTT Technical Research Centre of Finland)
Ahopelto, Jouni (VTT Technical Research Centre of Finland)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)

Date:	2014
Abstract:	We report on stress induced changes in the dispersion relations of acoustic phonons propagating in 27 nm thick single crystalline Si membranes. The static tensile stress (up to 0. 3 GPa) acting on the Si membranes was achieved using an additional strain compensating silicon nitride frame. Dispersion relations of thermally activated hypersonic phonons were measured by means of Brillouin light scattering spectroscopy. The theory of Lamb wave propagation is developed for anisotropic materials subjected to an external static stress field. The dispersion relations were calculated using the elastic continuum approximation and taking into account the acousto-elastic effect. We find an excellent agreement between the theoretical and the experimental dispersion relations.
Grants:	European Commission 309150 Ministerio de Ciencia e Innovación CSD2010-0044 Ministerio de Economía y Competitividad MAT2012-31392
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Acoustic phonons ; Brillouin light scattering ; Ultra-thin Si membranes
Published in:	New journal of physics, Vol. 16 (July 2014) , art. 73024, ISSN 1367-2630

DOI: 10.1088/1367-2630/16/7/073024

13 p, 1.2 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles