Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Plasmonics and Nanooptics
O 59.32: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-OG1
Large-area, low-cost, ultra-broad bandwidth Nickel-based plasmonic perfect absorber — •Ramon Walter1, Matthias Zilk2, Izzatjon Allayarov1, Forian Sterl1, Audrey Berrier3, Thomas Pertsch2, Thomas Weiss1, and Harald Giessen1 — 14th Physics Institute, University of Stuttgart — 2Institute of Applied Physics, Friedrich-Schiller University Jena — 31st Physics Institute, University of Stuttgart
Plasmonic devices with a very high absorption over a wide wavelength range have the potential for many applications such as light trapping, photo catalysis, and as black background for novel displays. Perfect absorber devices are the first choice to achieve such applications. Such systems can show a very high absorption at their plasmonic resonance, just by optimizing their system impedance to vacuum values.
We present a way to realize such system, just by using the "bad" plasmonic material nickel for nanostructures, placed over an aluminum mirror and a magnesium fluoride spacer. By using a variation of the well-known nanosphere lithography, we present a way to create such devices on a large-area scale. Simply by drop coating deposited polystyrene nanospheres, we create a mask for a subsequent dry-etching process with an Argon ion beam. The resulting device shows a very high absorption over 90% nearly over the complete visible range, very high over a wide range of incident angles, nearly independently of the polarization.
We believe that our design has to potential for many applications where a large bandwidth of light absorption is preferable.