Designing refractive index fluids using the Kramers-Kronig relations.
Journal article

Designing refractive index fluids using the Kramers-Kronig relations.

  • Sai T Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland. ullrich.steiner@unifr.ch bodo.wilts@unifr.ch and Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland.
  • Saba M Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland. ullrich.steiner@unifr.ch bodo.wilts@unifr.ch.
  • Dufresne ER Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland.
  • Steiner U Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland. ullrich.steiner@unifr.ch bodo.wilts@unifr.ch.
  • Wilts BD Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland. ullrich.steiner@unifr.ch bodo.wilts@unifr.ch.
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  • 2020-07-30
Published in:
  • Faraday discussions. - 2020
English For a number of optical applications, it is advantageous to precisely tune the refractive index of a liquid. Here, we harness a well-established concept in optics for this purpose. The Kramers-Kronig relation provides a physical connection between the spectral variation of the (real) refractive index and the absorption coefficient. In particular, a sharp spectral variation of the absorption coefficient gives rise to either an enhancement or reduction of the refractive index in the spectral vicinity of this variation. By using bright commodity dyes that fulfil this absorption requirement, we demonstrate the use of the Kramers-Kronig relation to predictively obtain refractive index values in water solutions that are otherwise only attained with toxic specialised liquids.
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hybrid
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https://sonar.ch/global/documents/36016
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