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Merging Top-Down and Bottom-Up Approaches to Fabricate Artificial Photonic Nanomaterials with a Deterministic Electric and Magnetic Response

: Dietrich, K.; Zilk, M.; Steglich, M.; Siefke, T.; Hübner, U.; Pertsch, T.; Rockstuhl, C.; Tünnermann, A.; Kley, E.-B.

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Advanced Functional Materials 30 (2020), Nr.3, Art. 1905722, 8 S.
ISSN: 1616-301X
ISSN: 1616-3028
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
artificial photonic nanomaterial; cute-wire-pair; electron-beam lithography; optically isotropic material; self-assembly

Artificial photonic nanomaterials made from densely packed scatterers are frequently realized either by top-down or bottom-up techniques. While top-down techniques offer unprecedented control over achievable geometries for the scatterers, by trend they suffer from being limited to planar and periodic structures. In contrast, materials fabricated with bottom-up techniques do not suffer from such disadvantages but, unfortunately, they offer only little control on achievable geometries for the scatterers. To overcome these limitations, a nanofabrication strategy is introduced that merges both approaches. A large number of scatterers are fabricated with a tailored optical response by fast character projection electron-beam lithography and are embedded into a membrane. By peeling-off this membrane from the substrate, scrambling, and densifying it, a bulk material comprising densely packed and randomly arranged scatterers is obtained. The fabrication of an isotropic material from these scatterers with a strong electric and magnetic response is demonstrated. The approach of this study unlocks novel opportunities to fabricate nanomaterials with a complex optical response in the bulk but also on top of arbitrarily shaped surfaces.