Evidence of surface acoustic wave band gaps in the phononic crystals created on thin plates

Ted Jackson , Emmanuel Lafond (1) , Pierre Deymier (2) , Xinya Zhang , Jerome O. Vasseur (3)

1 Ecole Centrale Paris
2 Department of Material Science & Engineering
3 LDSMM - Laboratoire de dynamique et structure des matériaux moléculaires

Phononic structures and acoustic band gaps based on bulk materials have been researched in length in the past decades. However, few investigations have been performed on phononic structures in thin plates to form surface acoustic wave (SAW) band gaps. In this letter, we report a new type of phononic crystals manufactured by patterning periodical air-filled holes in thin plates. We confirmed the existence of SAW band gaps in the created phononic crystals through laser ultrasonics measurements. Wide multiple SAW band gaps and special structures, such as narrow pass bands within a band gap were observed experimentally.

Mots clés: Lamb waves; Alloys; Ultrasound; Phononic crystal; Surface acoustic waves; Crystal lattices; Laser ultrasonics; Photonic crystals; Acoustic band gaps; Electronic band structure

Domaines: Sciences de l'ingénieur [physics]; Physique [physics]

Ted Jackson, Emmanuel Lafond, Pierre Deymier, Xinya Zhang, Jerome O. Vasseur. Evidence of surface acoustic wave band gaps in the phononic crystals created on thin plates. Applied Physics Letters, 2006, 88 (4), pp.041911. ⟨10.1063/1.2167794⟩. ⟨hal-03302397⟩