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Nano Lett. 2007 Mar;7(3):733-7. Epub 2007 Feb 20.

Optical transduction of chemical forces.

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  • 1Department of Chemistry and Materials Science, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.


We describe a plasmonic crystal device possessing utility for optically transducing chemical forces. The device couples complex plasmonic fields to chemical changes via a chemoresponsive, surface-bound hydrogel. We find that this architecture significantly enhances the spectroscopic responses seen at visible wavelengths while enabling capacities for sensitive signal transduction, even in cases that involve essentially no change in refractive index, thus allowing analytical detection via colorimetric assays in both imaging and spectroscopic modes.

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