In this work an innovative and low cost optical chemical sensor, based on surface plasmon resonance in plastic opticalfiber, is presented and experimentally tested for the detection and analysis of trinitrotoluene (TNT). The fabricatedoptical chemical sensor was realized removing the cladding of a plastic optical fiber along half the circumference, spincoating on the exposed core a buffer of Microposit S1813 photoresist, and finally sputtering a thin gold film. AMolecularly Imprinted Polymer (MIP) film was deposited on the thin gold film for the selective detection of TNT. It hasbeen found that the sensor recognizes trinitrotoluene, since the SPR signal is affected by the presence of TNT in thepolymer, while with a slow response kinetics, probably due to the thickness of the polymeric layer.
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