SPR Sensors Based on Bilayer Metals in a D-shaped Plastic Optical Fiber: Analysis and Experimental Results with Different Metals

In this work, we report the design, implementation and characterization of SPR sensors in a D-shaped plastic optical fiber (POF), based on thin bilayers of different metals, combined titanium and gold films or palladium and gold films. These optical sensor platforms may be used for monitoring different bio-chemical receptors, particularly those with refractive indexes exceeding the typical values of aqueous phases, like for example polymeric artificial receptors. In this work different configurations have been investigated, which are all appropriate for molecularly imprinted polymers (MIPs) receptors