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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 23 — Aug. 10, 2006
  • pp: 5819–5826

Application of two-dimensional spectral surface plasmon resonance to imaging of pressure distribution in elastohydrodynamic lubricant films

H. P. Ho, C. L. Wong, K. S. Chan, S. Y. Wu, and Chinlon Lin  »View Author Affiliations


Applied Optics, Vol. 45, Issue 23, pp. 5819-5826 (2006)
http://dx.doi.org/10.1364/AO.45.005819


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Abstract

What we believe to be a novel two-dimensional spectral surface plasmon resonance imaging technique determining pressure distribution in elastohydrodynamic lubricant films is presented. This technique makes use of the spectral characteristics associated with the surface plasmon resonance (SPR) effect, and it provides more spectral information in refractive index mapping than conventional contrast SPR imaging. Two-dimensional imaging is demonstrated and applied to a highly pressurized liquid lubricant trapped inside an elastohydrodynamic lubrication (EHL) dimple. The hydrostatic pressure inside the EHL dimple causes a localized change of the refractive index of the lubrication oil. This also results in a shift in the spectral SPR absorption dip. By monitoring the color changes within the SPR image and calibrating with lubricants of known refractive index profiles, we can obtain a direct measurement of the refractive index distribution within the EHL dimple. PB 2400 lubricant dimples were studied in our experiments. The proposed SPR imaging approach is irrespective of the absolute lubricant film thickness h, therefore overcoming the major limitations of a conventional optical interference technique. With further development of the two-dimensional refractive index mapping technique, widespread applications in various fields are possible, including high-throughput sensors and the detection of bioaffinity interactions.

© 2006 Optical Society of America

OCIS Codes
(110.2970) Imaging systems : Image detection systems
(240.6680) Optics at surfaces : Surface plasmons

History
Original Manuscript: November 9, 2005
Revised Manuscript: March 10, 2006
Manuscript Accepted: March 15, 2006

Virtual Issues
Vol. 1, Iss. 9 Virtual Journal for Biomedical Optics

Citation
H. P. Ho, C. L. Wong, K. S. Chan, S. Y. Wu, and Chinlon Lin, "Application of two-dimensional spectral surface plasmon resonance to imaging of pressure distribution in elastohydrodynamic lubricant films," Appl. Opt. 45, 5819-5826 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-23-5819


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