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31 December 2019 Second harmonic generation from multilayer hexagonal boron nitride
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We report second harmonic generation (SHG) from thick hexagonal boron nitride (hBN) flakes with approximately 109 layers. Surprisingly, the resulting signal is stronger when compared to previously reported few-layer experiments that showed the SHG efficiency gradually decreasing with the increasing thickness. 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.
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Sejeong Kim, Johannes E. Fröch, Augustine Gardner, Chi Li, Igor Aharonovich, and Alexander S. Solntsev "Second harmonic generation from multilayer hexagonal boron nitride", Proc. SPIE 11201, SPIE Micro + Nano Materials, Devices, and Applications 2019, 112010J (31 December 2019);

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