Chen, YuAsswat, Hussam Awiid A2024-09-122024-09-122024-08-15https://hdl.handle.net/20.500.14154/73068This project investigates the refractive indices of gold nanoparticles (AuNPs) embedded silica matrices, aiming to determine how changes in the size, shape, and concentration of AuNPs influence the optical properties of the nanocomposites. The research utilised a UV/Vis spectrometer and Fresnel reflection apparatus to measure and analyse the refractive indices across various nanoparticle configurations. The experiments demonstrated that the size and concentration of AuNPs impact the refractive indices of the nanocomposites. Notably, larger nanoparticles and higher concentrations resulted in lower refractive indices. These findings, confirmed by measurements and analytical techniques, establish a clear relationship between nanoparticle characteristics and optical properties. The study concludes that careful adjustment of AuNP features within silica matrices can enhance the optical properties of materials, thereby improving the functionality of photonic devices. Further research into different nanoparticle materials and configurations is essential to advance the design and efficiency of miniaturised optical devices. This investigation broadens our understanding of nanocomposite materials in photonics, offering promising prospects for device miniaturisation and enhanced optical efficiency.28enApplied PhysicsOptical propertiesSurface plasmon resonance (SPR)AbsorptionFresnel reflection equationsRefractive indexGold nanoparticlesGold nanospheresGold nanorodsColloidal silicaThesis