Thermo-optic characterization of optically similar aqueous solutions using SMS/MMI fiber sensor

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AudienciaPúblico en generales_ES
CoberturaMéxicoes_ES
Fecha de ingreso2026-09-15T00:30:02Z
Fecha de publicación2026-01-01
ResumenAbstract Multimode interference (MMI) fiber sensors with singlemode–multimode–singlemode (SMS) structures based on no-core multimode fiber (NC-MMF), have been widely employed for refractive index (RI) sensing of liquid samples due to their simplicity, low cost, and high sensitivity to changes in the immersion medium. In this work, we investigate the temperature-dependent spectral response of an SMS/MMI fiber sensor immersed in aqueous solutions with closely similar RI. Aqueous solutions of tris(hydroxymethyl)aminomethane (Tris), urea, and fructose were selected as model analytes because they exhibit nearly indistinguishable RI properties under conventional room-temperature conditions. The thermo-optic response of the sensor was studied by performing controlled temperature sweeps from 25 °C to 45 °C. Experimental results reveal that, although the three solutions produce comparable concentration-dependent refractometric responses, they exhibit distinct nonlinear temperature-dependent spectral shifts. To explain this behavior, a numerical model based on MMI theory was developed, showing that the observed nonlinearities arise from the intrinsic nonlinear dependence of the MMI peak wavelength on the RI of the immersion medium. Consequently, small thermo-optic variations in the liquid samples are transformed into measurable nonlinear spectral signatures. The results demonstrate that SMS/MMI fiber sensors can provide access to thermo-optic information that is not available through conventional single temperature refractometry. The proposed approach highlights the potential of MMI devices as simple optical platforms for thermo-optic characterization of aqueous media and for the study of temperature-dependent optical properties in liquid samples with closely similar RI.es_ES
Doihttps://doi.org/10.1088/1361-6463/ae9f6ees_ES
URIhttps://riuat.uat.edu.mx/handle/123456789/1968
Idiomaeses_ES
EditorialIOP Publishinges_ES
RelaciónJournal of Physics D: Applied Physicses_ES
URL relacionadohttps://doi.org/10.1088/1361-6463/ae9f6ees_ES
DerechosAcceso abierto (Metadatos de producción científica)es_ES
Licenciahttp://purl.org/coar/access_right/c_abf2es_ES
FuenteJournal of Physics D: Applied Physics
TítuloThermo-optic characterization of optically similar aqueous solutions using SMS/MMI fiber sensores_ES
TipoArtículoes_ES
ArbitradoHa sido Arbitradoes_ES
AutorDelgadillo-González, Ruth K
AutorMar-Abundis, Nailea
AutorFuentes-Rubio, Yadira A
AutorDomínguez-Cruz, René F
AutorGuzmán-Sepúlveda, José R
AutorDelgadillo-González, Ruth Kes_ES
AutorMar-Abundis, Naileaes_ES
AutorFuentes-Rubio, Yadira Aes_ES
AutorDomínguez-Cruz, René Fes_ES
AutorGuzmán-Sepúlveda, José Res_ES
InstituciónUniversidad Autónoma de Tamaulipas
InstituciónUniversidad Autónoma de Tamaulipases_ES
Número36es_ES
Rango de páginas365104es_ES
URL relacionadahttps://doi.org/10.1088/1361-6463/ae9f6e
Tipo de artículoIndexado
Tipo de artículoIndexadoes_ES
Volumen59es_ES

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