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Designing Refractive Index Fluids using the Kramers-Kronig Relations

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 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 dial-in refractive index values in water solutions that are otherwise only attained by toxic specialised liquids.

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Article information


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

This article is Open Access

Faraday Discuss., 2020, Accepted Manuscript
Article type
Paper

Designing Refractive Index Fluids using the Kramers-Kronig Relations

T. Sai, M. Saba, E. Dufresne, U. Steiner and B. Wilts, Faraday Discuss., 2020, Accepted Manuscript , DOI: 10.1039/D0FD00027B

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