Orthogonal surface acoustic wave device based on langasite for simultaneous biosensing and biofouling removal

摘要

We report a combined three-dimensional structural and fluid structure interaction finite element study of an orthogonal surface acoustic wave (SAW) device based on langasite (LGS). Our simulation results indicate that simultaneous sensing and nonspecifically bound protein removal can be achieved through the use of multidirectional transducers on a single piezoelectric device. We find that the (0, 22, 90) Euler direction on the LGS-based device is suitable for biosensing via propagation of pure shear-horizontal waves, whereas the (0, 22, 0) direction allows for acoustic streaming induced biofouling removal through the propagation of mixed mode waves with prominent surface normal component. This study reveals the possibility of integrating sensing and biofouling removal functions on a single SAW device, thereby enhancing sensor performance.