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A comprehensive analysis of influence of probe geometry on localized surfaceplasmon resonance phenomenon is presented. Plasmonic responses of noble metalnanoparticles such as AuNPs and AgNPs have been exclusively examined byadopting D-type and tapered optical fiber probes for the detection of methanol.With increase in concentration of methanol, the effective refractive index ofthe medium changes which leads to alter absorbance characteristics of the NPs;thereby modulating the eventual output responses of the proposed sensor. Acomparative study has been presented with respective change in geometricalshapes of the probes to detect methanol. The sensitivity in case of D-typeprobe for detection of methanol is found to be ~0.09644 mV/ppm with AuNPs and~0.03038 mV/ppm with AgNPs. On the other hand, the sensitivity for AgNPs coatedprobe is found to be ~0.00389 mV/ppm and 0.00379 mV/ppm for AuNPs in case oftapered probe.

Influence of probe geometry of optical fibers in sensing volatile liquids through localized surface plasmon resonance