Non-radiative complete surface acoustic wave bandgap for finite-depth holey phononic crystal in lithium niobate

Didit Yudistira (1) , Yan Pennec (1) , Bahram Djafari-Rouhani (1) , Samuel Dupont (1) , Vincent Laude (2)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

We demonstrate the existence of non-radiative complete surface acoustic wave(SAW)bandgaps for two-dimensional piezoelectric phononic crystals of holes. Holes of finite depth in a semi-infinite LiNbO3 substrate are specifically considered. SAWbandgaps are determined from the band structure calculated with a three-dimensional finite element method taking into account material anisotropy and piezoelectricity. The effect of hole geometry on the bandgaps has been investigated. It is further found that the complete band gap does not close for moderately conical holes.

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]; Matériaux; Micro et nanotechnologies/Microélectronique

Didit Yudistira, Yan Pennec, Bahram Djafari-Rouhani, Samuel Dupont, Vincent Laude. Non-radiative complete surface acoustic wave bandgap for finite-depth holey phononic crystal in lithium niobate. Applied Physics Letters, 2012, 100, pp.061912. ⟨10.1063/1.3684839⟩. ⟨hal-00759306⟩