Highly Confined Love Waves Modes by Defects States in a Phononic Crystal Based on Holey-SiO2/ST-Cut Quartz Structure

Proceedings

Yu-Xin Liu¹  Olivier Bou Matar¹  Abdelkrim Talbi¹  Philippe Pernod¹ 

[1] Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520 IEMN, LIA LICS/LEMAC, 59650 Lille, France;

关键词: phononic crystal;    love waves;    band gap;    defect;   

DOI  :  10.3390/proceedings2130729

来源: DOAJ

【 摘 要 】

We investigate the properties of highly confined Love modes in a phononic crystal based on an array of holes made in SiO₂ deposited on ST-cut Quartz substrate. An optimal choice of the geometrical parameters of the holes enables us to obtain wide stop-bands frequency for shear wave’s modes. The introduction of defect by removing lines of holes leads to nearly flat modes within the band gap and consequently paves the way to implement advanced design of electroacoustic filters and high-performance cavity resonators based on shear wave modes. The calculations are performed using finite element method based on the commercial software (COMSOL-Multiphysics). For transmission spectra, piezoelectric excitations are applied by considering the interdigital transducers, with results corroborating well the band structure predictions and the position of defects modes within the band gap.

【 授权许可】

Unknown