State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Phys Rev Lett. 2019 Oct 25;123(17):173902. doi: 10.1103/PhysRevLett.123.173902.
We report enhanced optical nonlinear effects at the surface of an ultrahigh-Q silica microcavity functionalized by a thin layer of organic molecules. The maximal conversion efficiency of third harmonic generation reaches ∼1680%/W^{2} and an absolute efficiency of 0.0144% at pump power of ∼2.90 mW, which is approximately 4 orders of magnitude higher than that in a reported silica microcavity. Further analysis clarifies the elusive dependence of the third harmonic signal on the pump power in previous literature. Molecule-functionalized microcavities may find promising applications in high-efficiency broadband optical frequency conversion and offer potential in sensitive surface analysis.
我们报告了在经过一层薄有机分子功能化的超高 Q 值硅微腔表面上增强的光学非线性效应。三阶谐波转换效率在约 2.90 毫瓦的泵浦功率下达到了 ∼1680%/W^{2}，绝对效率为 0.0144%，这比以前报道的硅微腔高约 4 个数量级。进一步的分析澄清了以前文献中三阶谐波信号对泵浦功率的难以捉摸的依赖性。分子功能化微腔可能在高效宽带光频转换中有很有前途的应用，并在敏感的表面分析方面有很大的潜力。
