Large few-layer hexagonal boron nitride flakes for nonlinear optics
Nils Bernhardt, Sejeong Kim, Johannes E Froch, Simon JU White, Ngoc My Hanh Duong, Zhe He, Bo Chen, Jin Liu, Igor Aharonovich, Alexander S Solntsev
OPTICS LETTERS | OPTICAL SOC AMER | Published : 2021
Hexagonal boron nitride (hBN) is a layered dielectric material with a wide range of applications in optics and photonics. In this work, we demonstrate a fabrication method for few-layer hBN flakes with areas up to 5000µm2. We show that hBN in this form can be integrated with photonic microstructures: as an example, we use a circular Bragg grating (CBG). The layer quality of the exfoliated hBN flake on and off a CBG is confirmed by Raman spectroscopy and second-harmonic generation (SHG) microscopy. We show that the SHG signal is uniform across the hBN sample outside the CBG and is amplified in the center of the CBG.
Awarded by Australian Research Council
University of Technology Sydney (Seed Funding Grant); Australian Research Council (DE180100070, DP180100077).