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Q: Fachverband Quantenoptik und Photonik

Q 43: Quantum Technologies

Q 43.6: Poster

Mittwoch, 16. März 2022, 16:30–18:30, P

Fabrication of nanostructured van der Waals heterostructures — •Khairi Elyas¹, Hannah C. Nerl², Johanna Richter³, Kirill Bolotin³, and Katja Höflich¹ — ¹Ferdinand Braun Institut gGmbH, Berlin, Germany — ²Humboldt Universität zu Berlin, Berlin, Germany — ³Freie Universität Berlin, Berlin, Germany

Two-dimensional (2D) materials can exhibit a significantly enhanced light-matter interaction making them interesting for highly-confined and low-loss light transport. When combining different 2D materials the corresponding polaritonic modes may hybridize providing the strong localization of plasmonic excitations in combination with the long propagation distances of phonon modes.

Here we report on the fabrication of heterostructures of the (semi)metallic graphene and the wide-bandgap material hexagonal boron (hBN) nitride. The dry-release transfer of graphene and hBN makes use of polydimethylsiloxane(PDMS) and poly(propylene) carbonate (PPC) films. Due to the strong adhesion between PPC and 2D materials at room temperature, we show that single-layer to few-layer graphene as well as few-layer hBN can be produced on a spin coated PPC film/SiO2/Si substrates by mechanical exfoliation. Using He ion beam patterning we further modify the geometry of the heterostructures on the nanoscale with the specific aim to tune hybrid polaritonic modes. The optical properties of the fabricated heterostructures are then mapped using monochromated low-loss scanning transmission electron microscopy (STEM) electron energy-loss spectroscopy (EELS).