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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 2 — Mar. 4, 2013

Biosensing using straight long-range surface plasmon waveguides

Oleksiy Krupin, Hamoudi Asiri, Chen Wang, R. Niall Tait, and Pierre Berini  »View Author Affiliations

Optics Express, Vol. 21, Issue 1, pp. 698-709 (2013)

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Straight long-range surface plasmon waveguides are demonstrated as biosensors for the detection of cells, proteins and changes in the bulk refractive index of solutions. The sensors consist of 5 μm wide 22 nm thick Au stripes embedded in polymer (CYTOPTM) with microfluidic channels etched into the top cladding. Bulk sensing is demonstrated by sequentially injecting six solutions of different refractive indices in 2 × 10−3 RIU increments; such index steps were detected with a signal-to-noise ratio of ~1000. Selective capture of cells is demonstrated using Au waveguides functionalized with antibodies against blood group A, and red blood cells of group A and O in buffer as positive and negative analyte. Bovine serum albumin in buffer was used to demonstrate protein sensing. A monolayer of bovine serum albumin physisorbed on a carboxyl-terminated self-assembled monolayer on Au was detected with a signal-to-noise ratio of ~300. Overall, the biosensor demonstrated a good capability for detecting bulk changes in solution and for sensing analyte over a very wide range of mass (from cells to proteins). The biosensors are compact, inexpensive to fabricate, and may find use over a wide range of cost-sensitive sensing and detection applications.

© 2013 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7390) Optical devices : Waveguides, planar
(240.6680) Optics at surfaces : Surface plasmons
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(250.5403) Optoelectronics : Plasmonics

ToC Category:

Original Manuscript: October 2, 2012
Revised Manuscript: December 21, 2012
Manuscript Accepted: December 21, 2012
Published: January 7, 2013

Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics

Oleksiy Krupin, Hamoudi Asiri, Chen Wang, R. Niall Tait, and Pierre Berini, "Biosensing using straight long-range surface plasmon waveguides," Opt. Express 21, 698-709 (2013)

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