2021年3月3日 · Here, we report highly tunable second harmonic generation (SHG) from nanomechanically rotatable stacks of bulk hexagonal boron nitride (BN) crystals and introduce the term twistoptics to describe studies of optical properties in twistable vdW systems.

Herein, we report on the controlled growth of large-area and continuous ultrathin h-BN films with a high density of exposed edges that show strongly enhanced SHG, owing to the breaking of inversion symmetry occurring naturally at edge sites.

2013年5月29日 · We have measured optical second-harmonic generation (SHG) from atomically thin samples of MoS 2 and h-BN with one to five layers. We observe strong SHG from materials with odd layer thickness, for which a noncentrosymmetric structure is expected, while the centrosymmetric materials with even layer thickness do not yield appreciable SHG.

2024年6月6日 · This intrinsic architecture produces a strong nonlinear optical response in individual multiwalled BNNTs, enabling second-harmonic generation (SHG) with a conversion efficiency up to 0.01% and ...

2018年7月4日 · Our results reveal that by alloying TMD and BN layers, the χ (2) response improves in particular ranges of energy which makes them attractive for robust nonlinear optical devices. In particular,...

Here, we report a strong correlation between the interlayer stacking structures and optical and topological properties in chemically grown h -BN bilayers, measured mainly by using dark-field transmission electron microscopy (DF-TEM) and optical second harmonic generation (SHG) …

2021年9月24日 · 六方氮化硼 (h-BN) 层状材料的光学二次谐波 (SHG) 效率受对称性的影响很大，这严重限制了它们的 SHG 在非线性光学应用中的有用性。 在此，我们报告了大面积和连续超薄 h-BN 薄膜的受控生长，该薄膜具有高密度的暴露边缘，由于边缘位置自然发生的反转对称性破坏，显示出强烈增强的 SHG。 通过将图灵不稳定性引入到涉及熔融氧化硼 (B 2 O 3 ) 与气态氨 (NH 3) 在高温下。 值得注意的是，边缘富集的 BN 薄膜产生的 SHG 响应比通过相同生长方法但具 …

2024年8月21日 · We measure the second-harmonic generation (SHG) in twisted h-BN single-crystals. 2DM with broken inversion symmetry, such as h-BN, have a strong second-order nonlinear optical response (χ(2...

2024年10月9日 · 谐波是一种n个光子同时与材料相互作用并转换为一个光子的非线性光学过程。 二次谐波（second harmonic generation，SHG，两个光子变成一个光子）和三次谐波（third harmonic generation ，THG，三个光子变成一个光…

In this tutorial, we compute the Second-harmonic generation (SHG) from the dynamics of the Bloch-states. The equation-of-motion of the Bloch-states is explained in the tutorial on Linear response from Bloch-states dynamics. Independently of the 'experiment' we simulate, the part of the integration of motion stays the same.