A Comparison of Kretschmann-Raether Angular Regimes for Measuring Changes in Bulk Refractive Index

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We compare 2 angular regimes for the measurement of changes in the real refractive index of bulk fluid analytes. The measurements are based on the use of the Kretschmann-Raether configuration to sense a change in reflectivity with index. Specifically, we numerically simulate the relative sensitivities of the total internal reflection (TIR) and surface-plasmon resonance (SPR) regimes. For a fixed-angle apparatus, the method which gives the greatest change in reflectivity varies with metal film thickness. For films thicker than the skin depth, the SPR regime is the most sensitive to index changes. For thinner films, however, the TIR angle is then ... continued below

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16 p.

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KASUNIC, K.J. September 16, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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We compare 2 angular regimes for the measurement of changes in the real refractive index of bulk fluid analytes. The measurements are based on the use of the Kretschmann-Raether configuration to sense a change in reflectivity with index. Specifically, we numerically simulate the relative sensitivities of the total internal reflection (TIR) and surface-plasmon resonance (SPR) regimes. For a fixed-angle apparatus, the method which gives the greatest change in reflectivity varies with metal film thickness. For films thicker than the skin depth, the SPR regime is the most sensitive to index changes. For thinner films, however, the TIR angle is then dominant, with increases in sensitivity on the order of 75% for 10 nm gold or silver media.

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16 p.

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OSTI as DE00012677

Medium: P; Size: 16 pages

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  • Journal Name: Applied Optics; Other Information: Submitted to Applied Optics

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  • Report No.: SAND99-2410J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 12677
  • Archival Resource Key: ark:/67531/metadc624454

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Office of Scientific & Technical Information Technical Reports

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  • September 16, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 3:15 p.m.

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KASUNIC, K.J. A Comparison of Kretschmann-Raether Angular Regimes for Measuring Changes in Bulk Refractive Index, article, September 16, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc624454/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.