LAUSR

Abstract In this work, a novel structure has been proposed in order to design a highly sensitive phononic-crystals-based sensor for sensing different water-ethanol mixtures. The proposed structure consists of the steel background and water-filled holes as inclusions. Having a resonant mode inside the band gap is very important for wave propagation inside the structure and performance analysis of the sensor. The defect mode has been created by utilizing a linear radii-decreased hollow cylinder. Also, the proposed structure includes two unequal pathways to use the interferometric advantages of the asymmetric Mach-Zehnder interferometers. In this work, the frequency change arises by changing the material concentration of defects area which is a water-ethanol mixture. The proposed phononic crystal-based sensor displays this frequency change well by varying the sound’s speed of the propagating wave inside the structure. Finally, the sensor was optimized for a sensing step of 0.2% concentration of the analyzed mixture.