Volume 97, Number 4, February 2012
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||20 February 2012|
Evidence of slow acoustic surface waves on a 1D phononic surface by a pulsed laser spectroscopic technique resolved in time and space
European Laboratory for Non-Linear Spectroscopy (LENS), Università a di Firenze - Via N. Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy EU
2 Dipartimento di Fisica ed Astronomia, Università di Firenze - Via Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy, EU
3 Istituto Nazionale di Ottica (INO)-CNR - Largo E. Fermi 6, I-50125, Firenze, Italy, EU
Accepted: 18 January 2012
We report the investigation of surface acoustic waves (SAWs) propagating on a 1D phononic surface (PS) by the heterodyne-detected transient reflecting grating technique. A suitable experimental configuration enables the excitation of traveling SAWs with variable wave numbers and the measurement of their propagation with temporal and spatial resolution. Using the full characterization of the band diagram of this PS, as reported previously (Malfanti I., Taschin A., Bartolini P., Bonello B. and Torre R., J. Mech. Phys. Solids, 59 (2011) 2370), we studied the dispersion properties of the SAWs as the wave number approaches the Brillouin zone edge. SAW-packet group velocities show a clear slowing-down process approaching the BZ edge, with a measurable minimum velocity of about 140 m/s
PACS: 43.35.Pt – Surface waves in solids and liquids / 63.22.-m – Phonons or vibrational states in low-dimensional structures and nanoscale materials / 78.47.jj – Transient grating spectroscopy
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.