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

0517726 - FZÚ 2020 RIV NL eng J - Journal Article
Liu, Y. - Talbi, A. - Djafari-Rouhani, B. - El Boudouti, E.H. - Drbohlavová, Lucie - Mortet, Vincent - Bou Matar, O. - Pernod, P.
Interaction of Love waves with coupled cavity modes in a 2D holey phononic crystal.
Physics Letters. A. Roč. 383, č. 13 (2019), s. 1502-1505. ISSN 0375-9601. E-ISSN 1873-2429
R&D Projects: GA AV ČR(CZ) Fellowship J. E. Purkyně
Grant - others:AV ČR(CZ) Fellowship J. E. Purkyně
Program: Fellowship J. E. Purkyně
Institutional support: RVO:68378271
Keywords : cavity mode * coupling mode * Love waves * phononic crystals * quality factor
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.278, year: 2019
Method of publishing: Limited access
https://doi.org/10.1016/j.physleta.2019.01.053

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 SiO 2 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 crystal size.
Permanent Link: http://hdl.handle.net/11104/0303020