Presentation Information
[We-P-70]Mechanism of Light Absorption in Ultrablack Sputtered Zn Nanostructured films: A Combined Core-Shell Plasmonic and Effective Medium Approach
〇Michał Adam Borysiewicz1, Patrycja Barańczyk1, Anna Wróblewska2, Mariusz Zdrojek2, Tomasz Wojciechowski3, Rafał Zybała1 (1. Łukasiewicz Research Network - Institute of Microelectronics and Photonics (Poland), 2. Faculty of Physics, Warsaw University of Technology (Poland), 3. International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences (Poland))
We observe ultra-black appearance of nanocoral porous Zn films. We explain it using a core-shell plasmonic model. Dielectric loading from a native ZnO shell maximizes absorption cross-sections, while a hierarchical "reef" structure promotes multiple scattering and efficient light trapping.