2019/02/28 by Sejeong Kim, Johannes E. Fröch, Augustine Gardner +3 · 1 citation
Physics and Astronomy · #physics.optics
paper · pdf · doi:10.1364/ol.44.005792
arxiv created 2019/11/07 · arxiv updated 2020/01/08
We report second-harmonic generation (SHG) from thick hexagonal boron nitride (hBN) flakes with approximately 109-111 layers. The resulting effective second-order susceptibility is similar to previously reported few-layer experiments. This confirms that thick hBN flakes can serve as a platform for nonlinear optics, which is useful because thick flakes are easy to exfoliate while retaining a large flake size. We also show spatial second-harmonic maps revealing that SHG remains a useful tool for the characterization of the layer structure even in the case of a large number of layers.