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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 19 — Jul. 1, 2000
  • pp: 3314–3320

Surface-plasmon resonance spectrometry and characterization of absorbing liquids

Alexandre A. Kolomenskii, Paul D. Gershon, and Hans A. Schuessler  »View Author Affiliations


Applied Optics, Vol. 39, Issue 19, pp. 3314-3320 (2000)
http://dx.doi.org/10.1364/AO.39.003314


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Abstract

The effect of absorption of the sample medium on the surface-plasmon resonance (SPR) characteristics is analyzed by approximate analytical and exact numerical models. We show that absorption leads to specific changes in the value of reflectivity near the SPR angle and that these can be used for absorbance detection. The strongest absorption-induced change in reflectivity occurs at two values of metal film thickness (28 and 55 nm for a gold film and λ = 632.8 nm). Using a sample solution of Rhodamine 700 in ethanol, we measured the characteristic changes in the SPR angle and in reflectivity over the wavelength interval encompassing the strong absorption band at 610–680 nm. The possibility of the simultaneous determination of the refractive index and absorption from SPR measurements is demonstrated and has the potential for substance-specific detection.

© 2000 Optical Society of America

OCIS Codes
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(240.6680) Optics at surfaces : Surface plasmons
(260.6970) Physical optics : Total internal reflection

History
Original Manuscript: September 24, 1999
Revised Manuscript: February 10, 2000
Published: July 1, 2000

Citation
Alexandre A. Kolomenskii, Paul D. Gershon, and Hans A. Schuessler, "Surface-plasmon resonance spectrometry and characterization of absorbing liquids," Appl. Opt. 39, 3314-3320 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-19-3314

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