Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Poster Monday: Plasmonics and Nanooptics
O 21.5: Poster
Montag, 1. April 2019, 17:45–20:00, Poster F
Investigations of angle-dependent reflection spectra of large-area, disordered perfect absorber structures with ultra-broad absorption — •Ramon Walter1, Matthias Zilk2, Izzatjon Allayarov1, Rostyslav Semenyshyn1, Gabriel Schnoering3, 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
So-called perfect absorber devices have the potential for many applications, such as light trapping, photocatalysis, and gas sensing. Such systems show very high absorption at their plasmonic resonance wavelength by optimizing their system impedance to vacuum values. Such perfect absorbers can keep their high absorption over a wide range of the incident angle when gratings mode are suppressed by a disordered arrangement of the plasmonic nanostructures, nearly independent of the polarization of the incoming light.
In this work, we investigate the potential of such devices with a very high absorption over a wide wavelength range, fabricated by colloidal Lithography. To approaches are possible, using a metal with a very broad plasmonic resonance, or creating perfect absorber system with multiple resonances, by using nanospheres of different sizes. We compare these two approaches and investigate the optical properties of the resulting devices under a wide range of incident angles.
We believe that our investigation can lead to improved designs with the potential for many applications.