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Volume 223, 2020
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Designing refractive index fluids using the Kramers–Kronig relations

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Abstract

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.

Graphical abstract: Designing refractive index fluids using the Kramers–Kronig relations

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Submitted
26 Feb 2020
Accepted
26 Mar 2020
First published
22 Apr 2020

This article is Open Access

Faraday Discuss., 2020,223, 136-144
Article type
Paper

Designing refractive index fluids using the Kramers–Kronig relations

T. Sai, M. Saba, E. R. Dufresne, U. Steiner and B. D. Wilts, Faraday Discuss., 2020, 223, 136
DOI: 10.1039/D0FD00027B

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