1. Liquid Crystals and Photonics Group ELIS Department Ghent University Technologiepark‐Zwijnaarde Gent 9052 Belgium
2. Photonics Research Group INTEC Department Ghent University‐imec Technologiepark‐Zwijnaarde Gent 9052 Belgium
3. Center for Nano‐ and Biophotonics (NB‐Photonics) Ghent University Technologiepark‐Zwijnaarde Gent 9052 Belgium
4. Sol‐gel Centre for Research on Inorganic Powders and Thin films Department of Chemistry Ghent University Krijgslaan 281‐S3 Gent 9000 Belgium