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Phonon dispersion in hypersonic two-dimensional phononic crystal membranes
Zitatschlüssel Graczykowski2015
Autor Graczykowski, B. and Sledzinska, M. and Alzina, F. and Gomis-Bresco, J. and Reparaz, J. S. and Wagner, M. R. and Sotomayor Torres, C. M.
Seiten 075414
Jahr 2015
ISBN 1098-0121 1550-235X
ISSN 1550235X 10980121
DOI 10.1103/PhysRevB.91.075414
Journal Physical Review B
Jahrgang 91
Nummer 7
Zusammenfassung textcopyright 2015 American Physical Society. We investigate experimentally and theoretically the acoustic phonon propagation in two-dimensional phononic crystal membranes. Solid-air and solid-solid phononic crystals were made of square lattices of holes and Au pillars in and on 250 nm thick single crystalline Si membrane, respectively. The hypersonic phonon dispersion was investigated using Brillouin light scattering. Volume reduction (holes) or mass loading (pillars) accompanied with second-order periodicity and local resonances are shown to significantly modify the propagation of thermally activated GHz phonons. We use numerical modeling based on the finite element method to analyze the experimental results and determine polarization, symmetry, or three-dimensional localization of observed modes.
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