مشخصات پژوهش

This study presents a novel approach utilizing a phononic crystal-based Notch filter in conjunction with the Fano resonance principle to distinguish between different molar fractions of Ethyl lactate within a mixture of Ethyl lactate and 2-Methoxy ethanol. This research marks the first instance of employing a Notch filter configuration in this specific solid–solid structure. The sensor design proposed features a 2D phononic crystal composed of a square lattice of PMMA as the base material, interspersed with circular Tungsten pillars measuring 7 mm × 7 mm in total size. The setup includes a direct waveguide linked to a single ring resonator, with each round of the ring resonator filled with varying concentrations of Ethyl lactate. The transmission frequency is notably affected by the different molar fractions of Ethyl lactate, in relation to their respective sound velocity and mass density characteristics. Furthermore, the efficacy of the sensor is validated using the Fano Anderson model, which closely aligns with the sensor’s performance. Additionally, the sensor design exhibits high-quality factor (Q), sensitivity (S), figure of merit (FOM), and limit of detection (LOD) with average values of 66,607, 314.54 Hz/%, 1048, and 477 × 10–7, respectively. It is capable of detecting variations in Ethyl lactate molar fractions, potentially indicating the presence of food additives or fragrances.