Propagation of acoustic surface waves on a phononic surface investigated by transient reflecting grating spectroscopy

Year: 2011

Authors: Malfanti I., Taschin A., Bartolini P., Bonello B., Torre R.

Autors Affiliation: Univ Florence, Dip Fis & Astron, I-50019 Florence, Italy; Univ Florence, European Lab Nonlinear Spect LENS, I-50019 Florence, Italy; CNR, INO, I-50125 Florence, Italy; INSP, F-75015 Paris, France.

Abstract: We present a study of surface acoustic waves (SAW) propagation on a 1D phononic surface (PS) by mean of an heterodyne-detected transient reflecting grating experiment. We excited and detected coherent stationary SAWs characterized by variable wave-vectors. The measured SAW frequencies enables the characterization of the band diagram of this PS sample beyond the first Brillouin zone (BZ). Four different SAW frequencies have been revealed, whose band diagram show articulated dispersion phenomena. In order to address the nature of the investigated SAWs, the experimental results are compared with a numerical simulation of elastic modes based on a finite element model. The observed SAWs are addressed to four Bloch waves characterized by different frequencies and surface energy localization. Moreover, we measured the SAW propagation on a flat non-phononic part of the sample surface and compared it with results from the PS.

Journal/Review: JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS

Volume: 59 (11)      Pages from: 2370  to: 2381

More Information: This research has been performed at European Laboratory for Non-Linear Spectroscopy (LENS) and supported with EC Grant N. RII3-CT-2003-506350. Matteo Mannini, from LAboratory for Molecular Magnetism (LA.M.M.), Dipartimento di Chimica Univ. di Firenze, performed the film deposition: many thanks for helpfulness and great accuracy. Gratitude goes to Michele De Regis, a new student in our group, for the help in collecting group velocities data. Finally we would like to acknowledge the people from CE.M.E. at Consiglio Nazionale delle Ricerche (CNR) for the scanning electron microscope images.
KeyWords: Time-resolved optical spectroscopy; Transient reflecting grating; Surface acoustic waves; Nano/micro structures; Phononic properties
DOI: 10.1016/j.jmps.2011.07.010

Citations: 22
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