SUMMARY

Non-reciprocal and topological wave propagation has become an active area of acoustics research owing to the anomalous and exceptional wave behavior with potential applications in robust and high-speed communication devices, signal/image processing, advanced sensors, and vibration isolation. This work explores such phenomena and their applications using one- and two-dimensional electro-acoustic systems. In one-dimensional systems, preliminary research (i) demonstrates giant non-reciprocity obtained by means of an electromechanical cell constructed using a field effect transistor, and (ii) investigates non-adiabatic shifting of topological interfaces performed using negative-capacitance shunt circuits and relays. (iii) As an application of topological acoustics in two-dimensional systems, an electroacoustic transistor has been designed wherein the presence of an incoming wave at a ‘gate’ terminal allows wave propagation between ‘source’ and ‘drain’ terminals elsewhere in the domain. The design was numerically verified using finite element analysis in preliminary work. The proposed work will fabricate and experimentally validate the electro-acoustic transistor design. Then, the demonstrated transistor will be utilized to design, configure and test logic gates. The findings from this work may guide future exploration of novel acoustic effects and inspire metamaterial designs to be implemented in the next-generation wave-based devices for communication, computing, in-situ monitoring in harsh environments and energy harvesting.