论文标题
从Niobate Metasurfaces中共鸣的第二次谐波生成
Resonantly tunable second harmonic generation from lithium niobate metasurfaces
论文作者
论文摘要
第二次谐波生成（SHG）是一种连贯的非线性现象，在激光颜色转换中起着重要作用。 Niobate锂（LN）具有较大的带隙和出色的二阶非线性，它是非线性频率转换的重要光学材料，涵盖了从紫外线到中红外的广泛频谱范围。在这里，我们在实验上证明了具有可控SHG特性的LN元信息。在MIE谐音中观察到SHG效率的明显增强。通过更改几何参数，因此我们设法在不同波长下选择性地提高了SHG效率。我们的结果将铺平一种以高灵活性开发的方式，即新型紧凑的非线性光源，例如生物传感和光学通信。
Second harmonic generation (SHG) is a coherent nonlinear phenomenon that plays an important role in laser color conversion. Lithium niobate (LN), which features both a large band gap and outstanding second-order nonlinearities, acts as an important optical material for nonlinear frequency conversion covering a wide spectral range from ultraviolet to mid-infrared. Here we experimentally demonstrate LN metasurfaces with controllable SHG properties. Distinct enhancements for the SHG efficiency are observed at Mie-resonances. And by changing the geometric parameters thus the resonances of the metasurfaces, we manage to selectively boost the SHG efficiency at different wavelengths. Our results would pave a way for developing with high flexibility the novel compact nonlinear light sources for applications, such as biosensing and optical communications.
