Designing refractive index fluids using the Kramers-Kronig relations.,Faraday Discussions

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Designing refractive index fluids using the Kramers-Kronig relations.
Faraday Discussions ( IF 3.3 ) Pub Date : 2020-04-22 , DOI: 10.1039/d0fd00027b
Tianqi Sai ₁ , Matthias Saba ₂ , Eric R Dufresne ₃ , Ullrich Steiner ₂ , Bodo D Wilts ₂

Affiliation

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.

中文翻译：

使用Kramers-Kronig关系设计折射率流体。

对于许多光学应用，精确地调整液体的折射率是有利的。在此，我们利用光学领域已确立的概念来实现此目的。Kramers-Kronig关系提供了（实际）折射率的光谱变化与吸收系数之间的物理联系。特别地，吸收系数的急剧的光谱变化引起该变化的光谱附近的折射率的增大或减小。通过使用满足该吸收要求的明亮商品染料，我们证明了使用Kramers-Kronig关系可预测性地获得水溶液中的折光率值，否则只能使用有毒的特种液体才能获得该折光率。

更新日期：2020-04-22

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