H-Shaped Multi-Analyte PCF-Integrated SPR Sensor For Multi-Industry Fluid Analysis

This research conducts a numerical investigation of a multi-analyte H-patterned photonic crystal fiber (PCF) sensor utilizing surface plasmon resonance (SPR) technology developed to recognize industrial fluids in various medical and chemical applications efficiently. The sensor incorporates two fluid channels, simultaneously detecting multiple analytes. It uses a gold-titanium dioxidecoated plasmonic layer, providing high sensitivity, improved electric field confinement, and chemical stability. The sensor is optimized for refractive index ranges of 1.34-1.38 in channel-I and 1.39-1.43 in channel-II, both with high accuracy. This study aims to develop a platform for real-time analyte monitoring. The Finite Element Method is applied for arithmetical assessment after refining the sensor's architectural parameters. The sensor demonstrates a peak wavelength sensitivityof 4,000 nm/RIU in channel-I and 28,000 nm/RIU in channel-II. Additionally, it achieves maximum amplitude sensitivitiesof <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{410.64 }\text{RIU}^{-1}$</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$1561.55 \text{RIU}^{-1}$</tex> in the respective channels. This corresponds to a resolution of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$2.5 \times 10^{-{6}}$</tex> RIU for channel-I and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3.57\times 10^{-7}$</tex> RIU for channel-II. This sensor is designed to detect unknown substances with RIs between 1.34 and 1.43, making it valuable for biological fluid diagnosis, food quality control, environmental monitoring, and chemical analysis.