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O: Fachverband Oberflächenphysik

O 65: Plasmonics and Nanooptics IV: Waveguides and Antennas

O 65.11: Vortrag

Mittwoch, 18. März 2020, 13:00–13:15, WIL A317

Fourier-space microspectroscopy of disordered plasmonic metasurfaces — •Florian Sterl, Ediz Herkert, Steffen Both, Thomas Weiss, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

The optical properties of plasmonic nanoparticle ensembles are not only determined by the particle shape and their size, but also by the nanoantenna arrangement. We present computational and experimental approaches to gain a better understanding of the impact of disorder on the far-field behavior of complex plasmonic metasurfaces. We treat the nanoantennas as dipoles, and simulate the electric field based on dipole-dipole interaction. We can then extract the wavelength-resolved far-field response and convert it into real-space and Fourier space RGB images. A designated Fourier microspectroscopy setup allows us to record the real- and Fourier-space images of plasmonic metasurfaces.

We consider different types of spatial disorder. In the case of `frozen-phonon disorder', each element is displaced from its initial lattice position by a random amount within a variable range. In the case of correlated disorder, the displacement of any element affects the surrounding elements with a certain correlation length and function. Our results show that the two classes of disorder can be clearly distinguished in real and Fourier space. These insights provide the possibility to design the visual appearance of a metasurface by tailored disorder.