Label-free optical biosensing using a horizontal air-slot SiNx microdisk resonator

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We demonstrate label-free optical biosensing using a horizontal air-slotted silicon-rich silicon nitride (SiNx) microdisk resonator. Due to the strong confinement of light in the air-slot, a large resonance shift of 6.2 nm is observed upon reaction of the biotin-functionalized disk with a streptavidin solution with concentration of 2.5 mu g/ml. Assuming a linear relationship between resonance shift and streptavidin concentration, we estimate the sensitivity to be 2.5 +/- 0.2 nm/(mu g/ml). Comparing this value with surface sensitivity of 5.7 nm/ nm calculated using FDTD simulations, a detection limit of 30 +/- 2 ng/ml, is extrapolated. (C) 2010 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2010-09
Language
English
Article Type
Article
Citation

OPTICS EXPRESS, v.18, no.20, pp.20638 - 20644

ISSN
1094-4087
DOI
doi.org/10.1364/OE.18.020638
URI
http://hdl.handle.net/10203/99335
Appears in Collection
NT-Journal Papers(저널논문)
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