DOI:
AUTHOR(S)
Md. Abdullah Al-Moti Pinto, Md. Rubel Basar, Md. Saiful Islam, Tanvir Ahmed
ABSTRACT
Plasmonic biosensors have gained substantial attention for their potential in real-time, label-free detection of biological and chemical analytes, particularly in medical diagnostics and environmental monitoring. In this work, we proposed a highly sensitive surface plasmon resonance (SPR)-based biosensor employing a monocore photonic crystal fiber (PCF) with a gold-coated outer surface. In contrast to traditional dual-core PCF designs, the proposed structure employs a compact single-core geometry with a gold plasmonic layer coated on the outer surface which can simplify the fabrication process while preserving strong light–plasmon interaction. The sensor’s optical performance is investigated using the finite element method (FEM) that reveals the maximum wavelength sensitivity of 18,000 nm/RIU, the amplitude sensitivity of 3012 RIU⁻¹, and the resolution of 5.6 × 10⁻⁶ RIU across the analyte refractive index (RI) range of 1.33 to 1.42. These results highlight the sensor’s high accuracy, broad detection range, and robust design, making it a strong candidate for real-time biological and biochemical sensing applications.
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