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Design and Optimization of SiON Ring Resonator-Based Biosensors for Aflatoxin M1 Detection

In this article, we designed and studied silicon oxynitride (SiON) microring-based photonic structures for biosensing applications. We designed waveguides, directional couplers, and racetrack resonators in order to measure refractive index changes smaller than 10(−6) refractive index units (RIU). We...

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Detalles Bibliográficos
Autores principales: Guider, Romain, Gandolfi, Davide, Chalyan, Tatevik, Pasquardini, Laura, Samusenko, Alina, Pucker, Georg, Pederzolli, Cecilia, Pavesi, Lorenzo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4541935/
https://www.ncbi.nlm.nih.gov/pubmed/26193276
http://dx.doi.org/10.3390/s150717300
Descripción
Sumario:In this article, we designed and studied silicon oxynitride (SiON) microring-based photonic structures for biosensing applications. We designed waveguides, directional couplers, and racetrack resonators in order to measure refractive index changes smaller than 10(−6) refractive index units (RIU). We tested various samples with different SiON refractive indexes as well as the waveguide dimensions for selecting the sensor with the best performance. Propagation losses and bending losses have been measured on test structures, along with a complete characterization of the resonator’s performances. Sensitivities and limit of detection (LOD) were also measured using glucose-water solutions and compared with expected results from simulations. Finally, we functionalized the resonator and performed sensing experiments with Aflatoxin M1 (AFM1). We were able to detect the binding of aflatoxin for concentrations as low as 12.5 nm. The results open up the path for designing cost-effective biosensors for a fast and reliable sensitive analysis of AFM1 in milk.