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 5000 μm. 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 a CBG is confirmed by 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 centre of the CBG.
@article{arxiv.2007.01558,
title = {Large few-layer hexagonal boron nitride flakes for nonlinear optics},
author = {Nils Bernhardt and Sejeong Kim and Johannes E. Froch and Simon White and Ngoc My Hanh Duong and Zhe He and Bo Chen and Jin Liu and Igor Aharonovich and Alexander S. Solntsev},
journal= {arXiv preprint arXiv:2007.01558},
year = {2021}
}