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Determination of the refractive indices of ionic liquids by ellipsometry, and their application as immersion liquids

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Abstract

In principle, ionic liquids (ILs) can serve as stable and less harmful high-refractive-index liquids (n>1.60). However, detailed information on their complex refractive indices and dispersions is rare. Therefore, we determined the optical constants of six commercially available low-index ILs (n ca. 1.4) and two high-index ILs (n max. 2.38) synthesized by us utilizing spectroscopic ellipsometry. Furthermore, we tested the ILs as immersion liquids for different photonic crystals. Analysis of the optical properties of these photonic crystals after infiltration demonstrates potential applications of ILs in optofluidics and as index-matching liquids.

© 2018 Optical Society of America

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Supplementary Material (6)

NameDescription
Data File 1       Dispersion of the refractive indices of six low index ionic liquids.
Data File 2       Dispersion of the refractive indices of [EMIM][BrI2] measured at three different temperatures.
Data File 3       Dispersion of the refractive index of [EMIM][I5] at 20°C.
Data File 4       Dispersion of the refractive indices of [EMIM][BrI2] measured at different angles of incidence at 20°C.
Visualization 1       Infiltration process of ionic liquid [BMIM][BF4] into a PMMA opal photonic crystal.
Visualization 2       infiltration process of ionic liquid [EMIM][BrI2] into a In2O3 inverse opal photonic crystal

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Equations (3)

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