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Abstract
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In this paper, we present a novel approach utilizing a phononic crystal-based T-shape structure for the detection of varying
concentrations of Ethyl lactate in the binary mixture of Ethyl lactate and 2-Ethoxy ethanol. This sensor structure is constructed
using a two-dimensional phononic crystal (PnC) consisting of a PMMA as the host matrix and a square periodic array of circular
Tungsten pillars. The design incorporates a T-shape waveguide that is side-coupled to four individual ring resonators. Each of
the ring resonators contains three embedded pillars with different concentrations of Ethyl lactate. The resonance potency of ring
resonators and the existence of these pillars within the ring resonators play a crucial role in the performance of the proposed sensor.
The sensor operates based on the resonance frequencies that are limited to specific concentrations of Ethyl lactate within each ring
resonator. The resonance frequency of transmission is highly sensitive to the different concentrations of Ethyl lactate, taking into
account their respective sound velocities and densities. As a result, the proposed sensor demonstrates exceptional characteristics
such as high-quality factor, high sensitivity, high figure of merit, suitable signal to noise ratio, high resolutions and low insertion
loss. The average values for these parameters are 198,118, 7885 Hz, 603, 177, 17.5 Hz, and − 1.67 dB, respectively. This sensor
is capable of detecting any changes in the concentrations of Ethyl lactate, which can be indicative of pharmaceutical preparations,
food additives, and fragrances.
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