多层六方氮化硼的二次谐波产生

Sejeong Kim, J. Fröch, Augustine Gardner, Chi Li, I. Aharonovich, A. Solntsev
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引用次数: 0

摘要

我们报道了大约109层厚的六方氮化硼(hBN)薄片的二次谐波产生(SHG)。令人惊讶的是,与先前报道的显示SHG效率随着厚度的增加而逐渐降低的少层实验相比,得到的信号更强。这证实了厚的hBN薄片可以作为非线性光学的平台,这是有用的,因为厚的薄片在保持大的薄片尺寸的同时很容易脱落。我们还展示了空间二次谐波图,揭示了即使在大量层的情况下,SHG仍然是表征层结构的有用工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Second harmonic generation from multilayer hexagonal boron nitride
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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