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Large few-layer hexagonal boron nitride flakes for nonlinear optics

Nils Bernhardt, Sejeong Kim, Johannes E. Fröch, Simon J. U. White, Ngoc My Hanh Duong, Zhe He, Bo Chen, Jin Liu, Igor Aharonovich, and Alexander S. Solntsev

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Abstract

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 $5000\;{{\unicode{x00B5}}}{{\rm{m}}^2}$. 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.

© 2021 Optical Society of America

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