Theoretical condition for transparency in mesoporous layered optical media: Application to switching of hygrochromic coatings

O. Deparis, M. N. Ghazzal, P. Simonis, S. Mouchet, H. Kebaili, J. De Coninck, E. M. Gaigneaux, J. P. Vigneron

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Abstract

Mesoporous Bragg stacks are able to change color upon infiltration or displacement of liquid compounds inside their porous structure. Reversible switching from transparency to coloration offers additional functionality. Based on Bruggeman's effective medium theory, we derive a transparency master equation, which is valid for bilayers of arbitrary host materials and pore-filling compounds. The transparency condition fixes pore volume fractions such that the effective refractive index is homogenized through the bilayer, hence, through arbitrary layered optical media built from this bilayer. This general concept is applied to the case of switching of hygrochromic coatings made of mesoporous mixed oxide Bragg stacks.

Original languageEnglish
Article number023704
Pages (from-to)3704
Number of pages4
JournalApplied Physics Letters
Volume104
Issue number2
DOIs
Publication statusPublished - 13 Jan 2014

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