Abstract
In this study, a unique combination of Silver (Ag) and Ga-doped ZnO (GZO) is used as plasmonic materials where both materials can be used for analyte detection. The sensor exhibits two distinct peaks within the same Refractive Index (RI) by which the sensing applications enhance. GZO is responsible for the first of the two peaks, while Ag contributes to the latter one. Along y-polarization, the highest value of double peak shift sensitivity (DPSS) known to date is found: 27,341.5 nm/RIU. The sensor also displays a high wavelength sensitivity (WS) of 27,360 nm/RIU and an amplitude sensitivity (AS) of 875.72 RIU−1. Additionally, the sensor demonstrates a high wavelength resolution of 6.032 × 10–6 and an amplitude resolution of 1.496 × 10–5. The sensor exhibits a linearity of R2 = 0.9973 and a figure of merit (FOM) of 243.4 RIU−1. Again, a ± 10 tolerance limit is tested without showing any significant change in confinement loss and resonant wavelength shift. The sensor is examined for a wide array of RI ranging from 1.27 to 1.41 extending its application to the detection of pharmaceutical products and various chemicals. Furthermore, machine learning regression algorithms have been explored in this work to find out the sensing parameters in RIs that were not numerically investigated. Random Forrest Regressor and K-Neighbors Regressor were found to be showing high accuracies of 90.176% and 95.54%, respectively. Using these two algorithms, the performance of the sensor in detecting various chemicals were predicted.
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Islam, M.R., Iftekhar, A.N.M., Hassan, A.A. et al. Double plasmonic peak shift sensitivity: an analysis of a highly sensitive LSPR-PCF sensor for a diverse range of analyte detection. Appl. Phys. A 129, 571 (2023). https://doi.org/10.1007/s00339-023-06851-3
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DOI: https://doi.org/10.1007/s00339-023-06851-3