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Strong Optical Coupling of Lattice Resonances in a Top-down Fabricated Hybrid Metal–Dielectric Al/Si/Ge Metasurface

  • Optical metasurfaces enable the manipulation of the light–matter interaction in ultrathin layers. Compared with their metal or dielectric counterparts, hybrid metasurfaces resulting from the combination of dielectric and metallic nanostructures can offer increased possibilities for interactions between modes present in the system. Here, we investigate the interaction between lattice resonances in a hybrid metal–dielectric metasurface obtained from a single-step nanofabrication process. Finite-difference time domain simulations show the avoided crossing of the modes appearing in the wavelength-dependent absorptance inside the Ge upon variations in a selected geometry parameter as evidence for strong optical coupling. We find good agreement between the measured and simulated absorptance and reflectance spectra. Our metasurface design can be easily incorporated into a top-down optoelectronic device fabrication process with possible applications ranging from on-chip spectroscopy to sensing.

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Author: Paul Oleynik, Fritz Berkmann, Sebastian Reiter, Jon Schlipf, Markus Ratzke, Yuji Yamamoto, Inga Anita FischerORCiD
DOI:https://doi.org/10.1021/acs.nanolett.3c05050
ISSN:1530-6984
ISSN:1530-6992
Title of the source (English):Nano Letters
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2024
Tag:hybridization; metamaterials; optoelectronics; semiconductors
Volume/Year:24
Issue number:10
First Page:3142
Last Page:3149
Way of publication:Open Access
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Experimentalphysik und funktionale Materialien
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