Temperature Sensitivity of Surface Phononic Crystals modes (SPnC) based on Ni Pillars array deposited on LiNBO3

This work focuses on the theoretical and experimental investigation of acoustic waves sensors based on 2D Surface Phononic Crystals (PnC). We investigated the temperature coefficient of frequency (TCF) for surface localized modes in 2D PnCs composed of Ni pillars deposited on Y-cut LiNBO
3
substrate. We demonstrated both theoretically and experimentally that near the first limit of the Brillouin zone, the surface acoustic wave's temperature sensitivity depends considerably on pillars stiffness temperature constants, theirs resonance modes and lattice symmetry of the PnC.