Combining whispering gallery mode lasers and microstructured optical fibers for in-vivo biosensing applications

A. Francois, K. J. Rowland, T. Reynolds, S. J. Nicholls, T. M. Monro

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

3 Citations (Scopus)


Whispering Gallery Modes (WGMs) have been widely studied for the past 20 years for various applications, including biological sensing. While the different WGM-based sensing approaches reported in the literature enable useful sensor characteristics, at present this technology is not yet mature, mainly for practical reasons. Our work has been focused on developing a simple, yet efficient, WGM-based sensing platform capable of being used as a dip sensor for in-vivo biosensing applications. We recently demonstrated that a dye-doped polymer microresonator, supporting WGMs, positioned onto the tip of a suspended core Microstructured Optical Fiber can be used as a dip sensor. In this architecture, the resonator is located on an air hole next to the fiber core at the fiber's tip, enabling a significant portion of the sphere to overlap with the guided light emerging from the fiber tip. This architecture offers significant benefits that have never been reported in the literature in terms of radiation efficiency, compared to the standard freestanding resonators, which arise from breaking the symmetry of the resonator. In addition to providing the remote excitation and collection of the WGMs' signal, the fiber also allows easy manipulation of the microresonator and the use this sensor in a dip sensing architecture, alleviating the need for a complex microfluidic interface. Here, we present our recent results on the microstructured fiber tip WGM-based sensor, including its lasing behavior and enhancement of the radiation efficiency as a function of the position of the resonator on the fiber tip. We also show that this platform can be used for clinical diagnostics and applying this technology to the detection of Troponin T, an acute myocardial infarction biomarker, down to a concentration of 7.4 pg/mL.

Original languageEnglish
Title of host publicationPhotonics North 2013
Place of PublicationBellingham, Washington
Number of pages13
ISBN (Print)9780819497918
Publication statusPublished - 23 Dec 2013
Externally publishedYes
EventConference on Photonics North 2013 - Ottawa, Canada
Duration: 3 Jun 20135 Jun 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceConference on Photonics North 2013


  • Biosensors
  • Microstructured Optical Fiber
  • Whispering Gallery Mode

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