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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 15 — Jul. 24, 2006
  • pp: 6724–6738

Plasmon-resonant gold nanorods as low backscattering albedo contrast agents

Amy L. Oldenburg, Matthew N. Hansen, Daniel A. Zweifel, Alexander Wei, and Stephen A. Boppart  »View Author Affiliations

Optics Express, Vol. 14, Issue 15, pp. 6724-6738 (2006)

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Plasmon-resonant gold nanorods are demonstrated as low back-scattering albedo contrast agents for optical coherence tomography (OCT). We define the backscattering albedo, a′, as the ratio of the backscattering to extinction coefficient. Contrast agents which modify a′ within the host tissue phantoms are detected with greater sensitivity by the differential OCT measurement of both a′ and extinction. Optimum sensitivity is achieved by maximizing the difference between contrast agents and tissue, |a′ca - a′tiss |. Low backscattering albedo gold nanorods (14 × 44 nm; λmax = 780 nm) within a high backscattering albedo tissue phantom with an uncertainty in concentration of 20% (randomized 2±0.4% intralipid) were readily detected at 82 ppm (by weight) in a regime where extinction alone could not discriminate nanorods. The estimated threshold of detection was 30 ppm.

© 2006 Optical Society of America

OCIS Codes
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(290.5850) Scattering : Scattering, particles

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: April 26, 2006
Revised Manuscript: July 6, 2006
Manuscript Accepted: July 7, 2006
Published: July 24, 2006

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

Amy L. Oldenburg, Matthew N. Hansen, Daniel A. Zweifel, Alexander Wei, and Stephen A. Boppart, "Plasmon-resonant gold nanorods as low backscattering albedo contrast agents for optical coherence tomography," Opt. Express 14, 6724-6738 (2006)

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