2D label-free imaging of resonant grating biochips in ultraviolet

2D images of label-free biochips exploiting resonant waveguide grating (RWG) are presented. They indicate sensitivities on the order of 1 pg/mm2 for proteins in air, and hence 10 pg/mm2 in water can be safely expected. A 320x256 pixels Aluminum-Gallium-Nitride-based sensor array is used, with an int...

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Bibliographic Details
Published in:Optics express 2010-05, Vol.18 (11), p.11472-11482
Main Authors: Bougot-Robin, K, Reverchon, J-L, Fromant, M, Mugherli, L, Plateau, P, Benisty, H
Format: Article
Language:English
Subjects:
Biosensing Techniques - instrumentation
Equipment Design
Equipment Failure Analysis
Optics
Physics
Protein Array Analysis - instrumentation
Refractometry - instrumentation
Staining and Labeling
Surface Plasmon Resonance - instrumentation
Transducers
Ultraviolet Rays
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Summary:2D images of label-free biochips exploiting resonant waveguide grating (RWG) are presented. They indicate sensitivities on the order of 1 pg/mm2 for proteins in air, and hence 10 pg/mm2 in water can be safely expected. A 320x256 pixels Aluminum-Gallium-Nitride-based sensor array is used, with an intrinsic narrow spectral window centered at 280 nm. The additional role of characteristic biological layer absorption at this wavelength is calculated, and regimes revealing its impact are discussed. Experimentally, the resonance of a chip coated with protein is revealed and the sensitivity evaluated through angular spectroscopy and imaging. In addition to a sensitivity similar to surface plasmon resonance (SPR), the RWGs resonance can be flexibly tailored to gain spatial, biochemical, or spectral sensitivity.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.18.011472