Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Focus Session: Photonic Structures from Polymer and Colloidal Self-Assembly
CPP 8.2: Vortrag
Montag, 5. September 2022, 15:30–15:45, H38
Strategies for increased colour saturation in colloidal photonic crystals — •Gudrun Bleyer1, Carina Bittner1, Lukas Roemling1, Nico Nees2, Eric Goerlitzer1, and Nicolas Vogel1 — 1Institute of Particle Technology (LFG), FAU, Erlangen, Germany — 2Chair of Applied Mathematics, FAU, Erlangen, Germany
Monodisperse polystyrene nanoparticles are easily synthesized using surfactant free emulsion polymerization, making them ideal accessible building block for photonic crystals via self-assembly.
However, structures made only with polystyrene display a whitish hue of colour as incoherent scattering at defects in the crystal structure overlaps with the photonic stop band from constructive interference. We investigate how the colour saturation in colloidal photonic crystals depends on the local and global ordering of the particles and the absorptive properties of additive materials.
First, we assemble photonic crystals using two methods resulting in structures displaying different defect characteristics. We then correlate the photonic properties as a function of these defects using correlative microscopy connecting optical imaging, reflectance spectra and SEM measurements to establish the structure-property relationship.
Secondly, we introduce absorbing material at defined positions within the colloidal photonic crystal with the goal to optimize not only the amount but the absorber position as well, allowing for an optimized colour saturation.