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- W3094213497 abstract "Soluble biomarkers obtained from human bodily fluids can act as a diagnostic tool for assessing the presence of a disease or monitoring its progression. Optical resonators are well suited for detecting disease biomarkers since they have both a high sensitivity due to a large evanescent field and high quality factors that allow monitoring minute concentrations of analyte. The research presented in this thesis concerns the development of integrated optical biosensors based on ring resonators realized on the Yb3+:Al2O3 material platform and demonstrates several proof-of-concepts thereof. A variety of biosensing schemes was explored to detect the cancer protein biomarker rhS100A4 from urine. First, undoped, passive Al2O3 ring resonators were developed and used as sensor by monitoring the shift of the resonance wavelength. A surface functionalization was applied to form a bioreceptor layer of Anti-S100A4 monoclonal antibodies to detect the rhS100A4 cancer protein biomarker from urine with a limit of detection of 3 nM. Second, single-mode Yb3+:Al2O3 ring and disk resonator lasers were realized for light emission at a wavelength around 1030 nm. These were used as sensors by monitoring the shift of the lasing wavelength by heterodyning their light emission with an external laser to form an optical beat note on a photodetector. This scheme improved the biomarker limit of detection by a factor of ten. Finally, mode-splitting of the resonances was induced by engineering gratings on the ring resonators. Self-referenced biosensing was realized by monitoring changes of the mode-splitting, which were only induced by biomarker binding and were insensitive to other, environmental perturbations. Using these gratings, microwave signals were generated from mode-splitting of lasers, which allow self-referenced sensors relying on novel sensing readout schemes and simpler devices. The developed optical sensing technologies of the Yb3+:Al2O3 material platform could benefit healthcare applications and medical diagnostics." @default.
- W3094213497 created "2020-10-29" @default.
- W3094213497 creator A5078748000 @default.
- W3094213497 date "2020-01-28" @default.
- W3094213497 modified "2023-10-03" @default.
- W3094213497 title "Sensing technologies on active and passive Al2O3 glass" @default.
- W3094213497 doi "https://doi.org/10.3990/1.9789036549660" @default.
- W3094213497 hasPublicationYear "2020" @default.
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