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HL: Fachverband Halbleiterphysik

HL 26: 2D Materials and Heterostructures: Quantum Emitters and Defects

HL 26.3: Vortrag

Mittwoch, 20. März 2024, 10:00–10:15, EW 201

Radial quasi Bound States in the Continuum fabricated from Hexagonal Boron Nitride — •Connor Heimig, Jonas Biechteler, Thomas Weber, Luca Sortino, and Andreas Tittl — Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany

We present a novel class of optical metasurfaces through the integration of the radial quasi Bound State in the Continuum (qBIC) concept into the realm of 2D van der Waals materials. Our design is underpinned by Radial qBICs, arising from structural asymmetry in a ring of trapezoid pair resonators fabricated from hexagonal Boron Nitride (hBN).

Overcoming the trade-off between refractive index and optical losses, symmetry-broken qBICs efficiently suppress radiation losses from hBN, enabling high-Q resonances across the entire visible spectrum. Leveraging the unique properties of a low-refractive index van der Walls material such as hBN, allows the development of a novel nanophotonic platform for enhanced light-matter interaction. This integrated approach further establishes an experimental foundation for the implementation of hBN as a photonic medium for metaoptics, offering prospects for compact, spectrally selective, and polarization-invariant metadevices for diverse on-chip photonics applications.

Keywords: Bound States in the Continuum; van der Waals Materials; Hexagonal Boron Nitiride; Optical Metasurfaces; Nanophotonics