Journal
OPTICS EXPRESS
Volume 19, Issue 12, Pages 11330-11339Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.011330
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Funding
- Army Research Office [W911NF-09-1-0101]
- National Science Foundation [ECCS0746296]
- Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0746296] Funding Source: National Science Foundation
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Porous silicon waveguide biosensors that utilize grating couplers etched directly into porous silicon are demonstrated for improved molecular detection capabilities. Molecules are infiltrated through the grating couplers into the waveguide where they can interact with a guided waveguide mode. Hybridization of nucleic acids inside the waveguide is shown to significantly perturb the wave vector of the guided mode and is detected through angle-resolved reflectance measurements. A detection sensitivity of 7.3 degrees/mM is demonstrated with selectivity better than 6:1 compared to mismatched sequences. Experimental results are in good agreement with calculations based on rigorous coupled wave analysis. Use of the all-porous silicon grating-coupled waveguide allows improved interaction of the optical field with surface-bound molecules compared to evanescent wave-based biosensors. (C)2011 Optical Society of America
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