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Proceedings Paper

Using whispering gallery mode micro lasers for biosensing within undiluted serum
Author(s): Tess Reynolds; Alexandre François; Nicolas Riesen; Michelle E. Turvey; Stephen J. Nicholls; Peter Hoffmann; Tanya M. Monro
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Paper Abstract

Although whispering gallery mode (WGM) biosensors have shown tremendous potential, they are still yet to find practical use as biomedical diagnostic tools. This is primarily due to the nature of the interrogation mechanism itself which relies on indirect measurement of the binding of a specific biomolecule onto the sensor through the associated refractive index change. Since nonspecific binding cannot be differentiated from the specific interaction of interest, this can result in a high rate of false positive readings when the detection is performed in complex biological samples.

Here we show that this inherent limitation can be solved using a relatively simple approach. This approach involves the development of a self-referenced biosensor consisting of two almost identically sized dye-doped polystyrene microspheres placed on adjacent holes at the tip of a suspended core optical fiber. Here self-referenced biosensing is demonstrated with the detection of Neutravidin in undiluted human serum samples. The fiber allows remote excitation and collection of the WGMs of the microspheres in a dip sensing setting. By taking advantage of surface functionalization techniques, one microsphere acts as a dynamic reference, compensating for nonspecific binding events, while the other microsphere is functionalized to detect the specific interaction. The almost identical size allows the two spheres to have virtually identical refractive index sensitivity and surface area. This ensures their responses to nonspecific binding and environmental changes are almost identical, whereby any specific changes such as binding events, can be monitored via the relative movement between the two sets of WGM peaks.

Paper Details

Date Published: 24 November 2016
PDF: 8 pages
Proc. SPIE 10013, SPIE BioPhotonics Australasia, 100132X (24 November 2016); doi: 10.1117/12.2242707
Show Author Affiliations
Tess Reynolds, The Univ. of Adelaide (Australia)
Alexandre François, The Univ. of Adelaide (Australia)
The Univ. of South Australia (Australia)
Nicolas Riesen, The Univ. of Adelaide (Australia)
The Univ. of South Australia (Australia)
Michelle E. Turvey, The Univ. of Adelaide (Australia)
Stephen J. Nicholls, The Univ. of Adelaide (Australia)
Peter Hoffmann, The Univ. of Adelaide (Australia)
Tanya M. Monro, The Univ. of Adelaide (Australia)
The Univ. of South Australia (Australia)

Published in SPIE Proceedings Vol. 10013:
SPIE BioPhotonics Australasia
Mark R. Hutchinson; Ewa M. Goldys, Editor(s)

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