Journal
IEEE SENSORS JOURNAL
Volume 8, Issue 11-12, Pages 2074-2079Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2008.2007663
Keywords
Bioplasmonics; biosensors; gold nanohole array; surface plasmon polariton (SPP); surface plasmon resonance (SPR)
Funding
- The MITRE Corporation
- Defense Advanced Research Projects Agency Center
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A transmission-based surface plasmon resonance (SPR) sensor for label-free detection of protein-carbohydrate and protein-protein binding proximate to a perforated gold surface is demonstrated. An SPR instrument makes real-time measurements of the resonant wavelength and/or the resonant angle of incidence of transmitted light; both are influenced by the presence of proteins at the gold surface-liquid interface. Ethylene glycol solutions with known refractive indexes were used to calibrate the instrument. A paired polarization-sensitive detector achieved an overall detection resolution of similar to 6.6 x 10(-5) refractive index units (RIU). Proof of principle experiments was performed with concanavalin A (Con A) binding to gold-adsorbed ovomucoid and anti-bovine serum albumin (BSA) binding to gold-adsorbed BSA.
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