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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 33 — Nov. 20, 2007
  • pp: 8068–8073

Improving the sensitivity limit of surface plasmon resonance biosensors by detecting mixed interference signals

W. Yuan, H. P. Ho, Y. K. Suen, S. K. Kong, and Chinlon Lin  »View Author Affiliations

Applied Optics, Vol. 46, Issue 33, pp. 8068-8073 (2007)

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We demonstrate that the sensitivity limit of intensity-based surface plasmon resonance (SPR) biosensors can be enhanced when we combine the effects of the phase and amplitude contributions instead of detecting the amplitude variation only. Experimental results indicate that an enhancement factor of as much as 20 times is achievable, yet with no compromise in measurement dynamic range. While existing SPR biosensor systems are predominantly based on the angular scheme, which relies on detecting intensity variations associated with amplitude changes only, the proposed scheme may serve as a direct system upgrade approach for these systems. The new measurement scheme may therefore lead to a strong impact in the design of SPR biosensors.

© 2007 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves

ToC Category:
Remote Sensing and Sensors

Original Manuscript: July 5, 2007
Revised Manuscript: August 27, 2007
Manuscript Accepted: September 17, 2007
Published: November 19, 2007

Virtual Issues
Vol. 2, Iss. 12 Virtual Journal for Biomedical Optics

W. Yuan, H. P. Ho, Y. K. Suen, S. K. Kong, and Chinlon Lin, "Improving the sensitivity limit of surface plasmon resonance biosensors by detecting mixed interference signals," Appl. Opt. 46, 8068-8073 (2007)

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