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Type: Conference paper
Title: Combining whispering gallery mode lasers and microstructured optical fibers for in-vivo biosensing applications
Author: François, A.
Rowland, K.
Reynolds, T.
Nicholls, S.
Monro, T.
Citation: Photonics North, 2013 / P. Cheben, J. Schmid, C. Boudoux, et al (eds.): 891518
Publisher: SPIE
Publisher Place: Online
Issue Date: 2013
Series/Report no.: Proceedings of SPIE
ISBN: 9780819497918
ISSN: 0277-786X
Conference Name: Photonics North (2013 : Ottawa, Canada)
Editor: Cheben, P.
Schmid, J.
Boudoux, C.
Chen, L.R.
Delage, A.
Janz, S.
Kashyap, R.
Lockwood, D.J.
Loock, H.P.
Mi, Z.
Statement of
A. François, K.J. Rowland, T. Reynolds, S.J. Nicholls, T.M. Monro
Abstract: 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. © 2013 SPIE.
Keywords: Biosensors
Whispering Gallery Mode
Microstructured Optical Fiber
Rights: © 2013 SPIE
DOI: 10.1117/12.2037511
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