Zhao Jianxu, Lu Hua, Zheng Jiadeng, Li Dikun, Zhang Yiqiao, Gan Xuetao, Zhao Jianlin
Opt Lett. 2024 Jun 1;49(11):3130-3133. doi: 10.1364/OL.524772.
Improving the conversion efficiency is particularly important for the generation and applications of harmonic waves in optical microstructures. Herein, we propose to enhance the efficiency of third harmonic generation by integrating a monolayer WS with the metal/dielectric/photonic crystal multilayer structure. The numerical simulations show that the multilayer structure enables to generate the Tamm plasmon mode between the metal film and photonic crystal around the telecommunication wavelength, which is consistent with the experimental result. By measuring with a self-built nonlinear optical micro-spectroscopy system, we find that the third harmonic signal can be reinforced by 16-fold through inserting the monolayer WS in the dielectric spacer. This work will provide a new way for improving nonlinear optical response, especially THG in multilayer photonic microstructures.
提高转换效率对于光学微结构中谐波的产生和应用尤为重要。在此，我们提出通过将单层WS与金属/电介质/光子晶体多层结构集成来提高三次谐波产生的效率。数值模拟表明，该多层结构能够在电信波长附近的金属膜和光子晶体之间产生塔姆等离激元模式，这与实验结果一致。通过使用自行搭建的非线性光学显微光谱系统进行测量，我们发现通过在电介质间隔层中插入单层WS，三次谐波信号可以增强16倍。这项工作将为改善非线性光学响应，特别是多层光子微结构中的三次谐波产生提供一种新方法。
