Imperfect phononic crystals work too : The effect of translational and mid-plane symmetry breaking on hypersound propagation
Babacic, Visnja (Adam Mickiewicz University)
Sledzinska, Marianna (Institut Català de Nanociència i Nanotecnologia)
Vasileiadis, Thomas (Adam Mickiewicz University)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Graczykowski, Bartlomiej (Adam Mickiewicz University)

Date:	2024
Abstract:	Translationally symmetric nanostructures, termed phononic crystals (PnCs), offer control over the propagation of acoustic phonons in the gigahertz (GHz) range for signal-processing applications and thermal management at sub-Kelvin temperatures. In this work, we utilize Brillouin light scattering to investigate the impact of symmetry breaking on GHz phonon propagation in PnCs made of holey silicon nanomembranes. We show that the lattice of thimble-like holes leads to broken mid-plane symmetry and, hence, to anticrossing acoustic band gaps. With the rising level of uncorrelated translational disorder, the phononic effects are gradually suppressed, starting at higher frequencies. Strikingly, the low-frequency partial Bragg bandgap remains robust up to the highest level of disorder.
Grants:	Agencia Estatal de Investigación SEV-2017-0706 Agencia Estatal de Investigación PCI2023-143399 Agencia Estatal de Investigación CEX2021-001214-S
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:	Phononic crystal ; Acoustic band gaps ; Brillouin spectroscopy ; Finite-element analysis ; Nanomaterials ; Light scattering
Published in:	APL materials, Vol. 12, Issue 4 (April 2024) , art. 41108, ISSN 2166-532X

DOI: 10.1063/5.0189694

8 p, 8.0 MB

The record appears in these collections:
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