The Master’s thesis entitled “D-Shape Optical Fiber Coated with Gold Nanoparticles for Refractive Index Sensing” discussed by student Dina Nemat Abdullah under the supervision of Asst.Prof. Dr. Hanan Jafar Tahir.
This research aims to design and fabricate a refractive index (RI) sensor by developing a D-shaped fiber optic sensor. This sensor is characterized by a simple manufacturing process and the use of low-cost equipment. It is compact and based on the side polishing of a specific length of coreless fiber (CF) in a structure consisting of single-mode fibers – coreless fibers – single-mode fibers (SCS), which relies on the principle of Mach-Zehnder interferometer (MZI).
The sensor was designed to detect different concentrations of solutions with refractive indices ranging from 1.33 to 1.38. This study investigated various properties of the D-shaped fiber optic sensor, including the effect of polishing depths (PD) and polishing lengths (DSCFL) on the sensor’s sensitivity.
To enhance sensitivity, the sensor underwent a coating process with a thin layer of gold nanoparticles (Au-NL) with varying thicknesses, and the effects of these films on the sensor’s properties were comprehensively studied, including linearity, sensitivity, limit of detection (LOD), and accuracy.
The results showed that the sensor coated with a 50 nm gold nanolayer exhibited remarkable sensitivity, reaching 228.5 nm/RIU, with a refractive index accuracy of 8.753×10−5 RIU and an impressive linear regression coefficient (R²) of 98.29%.
The future of (DSCF) sensors with gold nanolayers (Au-NL) looks promising due to their exceptional sensitivity, stability, linearity, and repeatability, making them potentially suitable for biological, chemical, and environmental pollution applications.

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