WGM sensors are a class of optical sensors in which light is tightly confined due to optical resonance within a circular geometry. Expensive tunable diode lasers are typically used to excite resonance in a WGM device, which can be a cost limiting factor in developing economies. Herein, we developed a “reverse tuning” method that eliminates the need for such expensive laser sources. We show the microbubble resonator (MBR), a sub class of WGM devices, is ideally suited for the reverse tuning method by tuning with temperature, pressure and refractive index changes. Reducing the cost of the MBR platform, by utilizing less expensive laser sources with fixed wavelength, increases the practicality of these devices for use in low resource settings. We expect our methods to reduce the total cost of the sensing platform from thousands to a few hundred dollars.

Original languageEnglish
Title of host publicationOptics and Biophotonics in Low-Resource Settings VIII
EditorsDavid Levitz, Aydogan Ozcan
ISBN (Electronic)9781510647718
StatePublished - 2022
EventOptics and Biophotonics in Low-Resource Settings VIII 2022 - Virtual, Online
Duration: Feb 20 2022Feb 24 2022

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceOptics and Biophotonics in Low-Resource Settings VIII 2022
CityVirtual, Online


  • Microbubble Resonators
  • Whispering Gallery Mode


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