论文标题
超高Q微孔子中分散管理的氧化铝涂料
Alumina coating for dispersion management in ultra-high Q microresonators
论文作者
论文摘要
二氧化硅光学微球经常表现出超高的质量因子，但是，它们的组速度分散体对于非线性光学元件至关重要，只能调节。我们通过实验表明，可以通过用氧化铝的保形纳米层涂层来设计二氧化硅微球的群速度分散，但在电信波长处保留其超高的光学质量因子（\ num {\ sim E7}）。使用原子层沉积技术进行介电涂层，以确保NM级的厚度控制，我们不仅实现了精细的分散量身定制，而且还保持了低表面粗糙度和材料吸收，以确保低光学损失。支持我们的实验结果的数值模拟表明，氧化铝层厚度是精确调整组速度分散体的有前途的技术。作为一种应用，我们证明了Kerr光学频率梳子的产生，表明氧化铝涂料还可以维持非线性光学现象所需的高光学强度。
Silica optical microspheres often exhibit ultra-high quality factors, yet, their group velocity dispersion, which is crucial for nonlinear optics applications, can only be coarsely tuned. We experimentally demonstrate that group-velocity dispersion of a silica microsphere can be engineered by coating it with conformal nanometric layers of alumina, yet preserving its ultra-high optical quality factors (\num{\sim e7}) at telecom wavelengths. Using the atomic layer deposition technique for the dielectric coating, which ensures nm-level thickness control, we not only achieve a fine dispersion tailoring but also maintain a low surface roughness and material absorption to ensure a low optical loss. Numerical simulations supporting our experimental results show that the alumina layer thickness is a promising technique for precise tuning of group-velocity dispersion. As an application we demonstrate the generation of Kerr optical frequency combs, showing that the alumina coatings can also sustain the high optical intensities necessary for nonlinear optical phenomena.
