Zubiate Orzanco, PabloRuiz Zamarreño, CarlosDel Villar, IgnacioMatías Maestro, IgnacioArregui San Martín, Francisco Javier2025-03-182025-03-182016-01-07Zubiate, P., Zamarreño, C. R., Del Villar, I., Matías, I. R., Arregui, F. J. (2015). D-shape optical fiber pH sensor based on Lossy Mode Resonances (LMRs). In [IEEE], 2015 IEEE Sensors (pp. 1-4). https://doi.org/10.1109/ICSENS.2015.7370421.978-1-4799-8202-810.1109/ICSENS.2015.7370421https://academica-e.unavarra.es/handle/2454/53765The fabrication and characterization of an optical fiber pH sensor based on Lossy Mode Resonances (LMRs) is presented. PAH/PAA polymeric thin-films fabricated onto side-polished D-shaped optical fibers are used as LMR supporting coatings. The thickness of PAH/PAA coatings can be modified as a function of the external medium pH. As a consequence of this variation, the effective refractive index of the structure will change, producing a shift of the LMR. The fabricated sensor has been used to measure pH from 4.0 to 5.0. This pH sensor showed a sensitivity of 101.3 nm per pH unit, which means a resolution of ~6×10-4 pH units by using a conventional communications Optical Spectrum Analyzer (OSA), which is an improvement over commercial pH sensors.application/pdfeng© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other work.Optical fiberLMRD-shapedThin filmsPAH/PAApHinfo:eu-repo/semantics/conferenceObject2025-03-18info:eu-repo/semantics/openAccess