Abstract
The propagation of both surface and flexural acoustic plate modes along y-rotated x-propagation GaPO4 piezoelectric substrates was studied for several y-cut angles: the phase velocity and coupling coefficient dispersion curves were theoretically calculated for two different electroacoustic coupling configurations. The investigation of the acoustic field profile across the plate thickness revealed the presence of thin plate modes having polarization predominantly oriented along the propagation direction, and hence suitable for operation in liquid environment. These modes include the linearly polarized Anisimkin Jr. and the quasi longitudinal plate modes, AMs and QLs, showing a phase velocity close to that of the longitudinal bulk acoustic wave propagating in the same direction. The temperature coefficient of delay (TCD) of these longitudinal modes was investigated in the −20 to 420 °C temperature range, in order to identify thermally stable or low TCD cuts. The power flow angle, i.e., the angle between the phase and group velocity vectors, was also estimated to evaluate the substrate anisotropy effect on the acoustic wave propagation. The GaPO4 intrinsic properties, such as its resistance to high temperature and its chemical inertness, make it especially attractive for the development of acoustic waves-based sensors for applications in harsh liquid environment.
Highlights
The electroacoustic devices based on the surface and bulk acoustic waves (SAW and BAW)propagation, such as resonators or delay lines, are known for their wide range of applications in chemical, biological and physical sensing fields
The present paper investigate the acoustic waves propagation along y-rotated x-GaPO4 substrates for several y-cut angles: The phase velocity, the coupling coefficient, the temperature coefficient of delay (TCD), the power flow angle (PFA) and the acoustic field profile of the propagating modes were investigated that are suitable for application in liquid ambient
The phase velocity and the coupling coefficient of surface and flexural acoustic plate modes propagating along y-rotated x-propagation GaPO4 piezoelectric substrates has been studied for several y-cut angles
Summary
The electroacoustic devices based on the surface and bulk acoustic waves (SAW and BAW). The fundamental symmetric Lamb mode, S0, as well as the higher order symmetrical and antisymmetrical modes have comparable longitudinal, shear-horizontal and shear-vertical displacement components, and velocity higher than that of the surrounding liquid medium, and they are not suitable for sensing application in liquids except in some special cases. I.e., the longitudinally polarized plate modes, are here theoretically investigated, that are suitable for sensing application in liquids (e.g., for the determination of density, viscosity, conductivity, permittivity, and detection of small mass changes) Such acoustic modes have not yet been fully exploited for sensing applications, their study introduces a new element in the landscape of the acoustic waves (AW) sensor field. The present paper investigate the acoustic waves propagation along y-rotated x-GaPO4 substrates for several y-cut angles: The phase velocity, the coupling coefficient, the temperature coefficient of delay (TCD), the power flow angle (PFA) and the acoustic field profile of the propagating modes were investigated that are suitable for application in liquid ambient
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