A Generalized Acoustic Framework for Multilayer Piezoelectric Platforms

Recent advances in thin-film transfer and ferroelectric poling have enabled the realization of multilayer piezoelectric films with spatially dependent polarization. Consequently, while conventional piezoelectric acoustic design leverages single orientations, researchers have recently begun exploring periodically poled piezoelectric films (P3Fs) to enhance performance. These platforms open the doors to new topologies, leveraging multiple piezoelectric orientations simultaneously for an application-optimized design. However, the complexities of these designs are nontrivial and require a detailed analysis of the material system under transformation and spatial variation. While many works have presented partial explanations within the context of their specific material system, a generalized acoustic framework that can be directly applied to any material system or design remains missing. In this work, we present a general acoustic framework for treating P3F platforms, which can then be directly applied to any system. Employing this framework, designers can rapidly test the feasibility of multilayer piezoelectric configurations in pursuit of enhanced performance.