Interaction of Love waves with coupled cavity modes in a 2D holey phononic crystal

Yuxin Liu (1, 2) , Abdelkrim Talbi (1, 2) , Bahram Djafari-Rouhani (1, 3) , Lucie Drbohlavová (4) , Vincent Mortet (4) , El Houssaine El Boudouti (5, 6) , Olivier Bou Matar (1, 2) , Philippe Pernod (1, 7, 2)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 AIMAN-FILMS - IEMN - Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN
3 PHYSIQUE - IEMN - Physique - IEMN
4 FZU / CAS - Institute of Physics of the Czech Academy of Sciences
5 Université Mohammed Premier [Oujda]
6 LPMR, Department de Physique, Faculty of science, University Mohammed I
7 LIA LICS/LEMAC - Laboratoire International associé sur les phénomènes Critiques et Supercritiques en électronique fonctionnelle, acoustique et fluidique

The interaction of Love waves with square array of pillars deposited on a cavity defined in a 2D holey phononic crystal is numerically investigated using Finite Element Method. First, the existence of SH surface modes is demonstrated separately for phononic crystals that consist of square arrayed holes, or rectangular arrayed Ni pillars, respectively in, or on, a SiO₂ film deposited on a ST-cut quartz substrate. The coupling between SH modes and torsional mode in pillars induces a transmission dip that occurs at a frequency located in the range of the band-gap of the holey phononic crystal. Second, a cavity is constructed by removing lines of holes in the holey phononic crystal and results in a transmission peak that matches the dip. The optimal geometrical parameters enable us to create a coupling of the cavity mode and the localized pillar mode by introducing lines of pillars into the cavity, which significantly improved the efficiency of the cavity without increasing the crystal size. The obtained results will pave the way to implement advanced designs of high-performance electroacoustic sensors based on coupling modes in phononic crystals.

Mots clés: Phononic crystals; Love waves; Cavity mode; Coupling mode; Quality factor

Domaines: Acoustique [physics.class-ph]

Yuxin Liu, Abdelkrim Talbi, Bahram Djafari-Rouhani, Lucie Drbohlavová, Vincent Mortet, et al.. Interaction of Love waves with coupled cavity modes in a 2D holey phononic crystal. Physics Letters A, 2019, 383 (13), pp.1502-1505. ⟨10.1016/j.physleta.2019.01.053⟩. ⟨hal-01914709⟩