Abstract
The design of a fibre optic surface plasmon resonance (SPR) sensor based on silver–goldalloy nanoparticle film is studied. The performance of the proposed sensor istheoretically analysed in terms of its signal-to-noise ratio (SNR) and sensitivity underdifferent conditions related to the metal layer with silver and gold nanoparticlesembedded together in layers to form a single alloy film. The effects of relatedparameters such as alloy composition ratio, metal nanoparticle size, and alloy filmthickness are studied and the physical reasoning behind the results is given. A logicalcomparison is carried out between a previously proposed metal-host based fibreoptic SPR sensor and the present one. The alloy based fibre optic SPR sensor isshown to have better performance than the metal-host based fibre optic SPRsensor.
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