Al2O3 microresonators for passive and active sensing applications

Michiel de Goede*, Lantian Chang, Meindert Dijkstra, Raquel Obregón, Javier Ramón-Azcón, Elena Martínez, Laura Padilla, Jaume Adan, Francesc Mitjans, Sonia M. García-Blanco

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

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The Al2O3 waveguide technology was explored for sensing applications. Passive microring resonators with a quality factor in air of 3.2×105 were developed with a bulk refractive index sensitivity of ~100 nm/RIU and limit of detection of ~10-6 RIU. These were functionalized to detect the biomarker rhS100A4 from urine down to concentrations of 3 nM. Furthermore, Al2O3:Yb3+ microdisk lasers were realized that exhibited single mode lasing operation in water. Their lasing wavelength was tuned by varying the bulk refractive index and a bulk refractive index sensitivity of ~20 nm/RIU with a LOD of ~3×10-6 was achieved.

Original languageEnglish
Title of host publicationOptical Sensors, Sensors 2018
PublisherOptical Society of America
VolumePart F110-Sensors 2018
ISBN (Electronic)9781557528209
ISBN (Print)978-1-943580-43-9
Publication statusPublished - 1 Jan 2018
EventOptical Sensors 2018 - Zurich, Switzerland
Duration: 2 Jul 20185 Jul 2018

Publication series

NameAdvanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF)


ConferenceOptical Sensors 2018


  • Diode pumped lasers
  • Distributed feedback lasers
  • Microdisk lasers
  • Optical pumping
  • Refractive index
  • Sensor performance

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