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A novel fiber-coupled ITO coated glass slide sensor for performing surfaceplasmon polariton chemical monitoring in the 3.5 um mid-IR range is reported.Efficient mid-IR fiber coupling is achieved with 3D laser written waveguides,and the coupling of glass waveguide modes to ITO SPPs is driven by the varyingphase matching conditions of different aqueous analytes across the anomalousdispersion range determined by their molecular fingerprints. By means of usingboth a mid-IR fiber supercontinuum source and a diode laser the excitation ofSPPs is demonstrated. The efficient optical monitoring of mid-IR SPPs in smartglass could have a broad range of applications in biological and chemicalsensing.

Mid-infrared surface plasmon polariton chemical sensing on fiber-coupled ITO coated glass