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710926.pdf (5.12 MB)

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2021-01-04

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/182012

Mode-splitting in a microring resonator for self-referenced biosensing

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Recurs relacionat

https://doi.org/10.1364/OE.411931

Resum

Self-referenced biosensing based on mode-splitting on a microring resonator is experimentally demonstrated. A Bragg grating integrated on the surface of the ring provides coupling between the clockwise and counterclockwise travelling modes of the pristine ring resonator lifting their degeneracy. The amount of mode-splitting is directly related to the reflectivity of the grating and it is only affected by structurally modifying the grating. Environmental perturbations to the surroundings of the gratings, such as temperature and bulk refractive index variations, have a minor effect on the amount of mode-splitting. This principle allows the realization of a self-referenced sensing scheme based on the detection of variations of the mode-splitting induced by structural changes to the grating. In this work, a polymethyl methacrylate (PMMA) Bragg grating is integrated onto a ring resonator in Al2O3. It is shown both theoretically and experimentally that the amount of splitting of a resonance varies minimally under temperature or bulk refractive index perturbations. However, the structural change of attaching a layer of biomolecules inside the grating does affect its reflectivity and the amount of mode splitting present. This result represents the first proof-of-concept demonstration of an integrated mode-splitting biosensor insensitive to temperature and refractive index variations of the liquid matrix where the molecules to be detected are embedded. The reported results pave the road towards the realization of truly self-referenced biosensors.

Matèries

Biosensors, Indicadors ambientals

Matèries (anglès)

Biosensors, Environmental indicators

Citació

Col·leccions

Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Articles publicats en revistes (Institut de Bioenginyeria de Catalunya (IBEC))
Publicacions de projectes de recerca finançats per la UE

Citació

GOEDE, Michiel de, et al. Mode-splitting in a microring resonator for self-referenced biosensing. Optics Express. 2021. Vol. 29, num. 1, pags. 346-358. ISSN 1094-4087. [consulted: 8 of June of 2026]. Available at: https://hdl.handle.net/2445/182012

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