Design of Surface Plasmon Resonance Sensor in Plastic Optical Fibers Based on Nano-antenna Arrays

In this work, we report the design process for an optimal response of plasmonic sensors, exploiting gold nano-antenna array geometry realized on a D-shaped plastic optical fiber (POF). We have used different nano-slot arrays geometry, made by realizing rectangular slots on the gold layer. The numerical results obtained with different geometrical parameters, such as Slot's length, Slot's width and spacing, are presented. The aim of this work is to consider a different approach to obtain a plasmonic sensor in POFs, in which the geometrical parameters of the slots can modify the sensor's response to the different analytes placed and bound on the gold layer. The polarization of the Magnetic Field and the different patterns of the nano-slot array, for example different spacing among the slots, influence the plasmonic phenomena: Localized Surface Plasmon Resonance, Surface Plasmon Resonance or both.