C. Malins, A. Doyle, B. D. MacCraith, F. Kvasnik, M. Landl, P. Šimon, L. Kalvoda, R. Lukaš, K. Pufler and I. Babusík
The realisation of an opto-chemical ammonia sensor suitable for personal monitoring tasks is described, comprising a cyanine dye immobilised in a microporous glass thin film. The fabrication of sensor platforms incorporating embossed grating couplers provides a compact optical design with effective waveguiding characteristics, resulting in reversible ammonia sensitivity in the 5-100 ppm range in under 2 min. Cross-sensitivity of sensor response with water and other potential interferents is considered.