Opt Lett. 2019 Jan 1;44(1):126-129. doi: 10.1364/OL.44.000126.
Strong light-matter interactions in resonant photonic nanostructures open up opportunities for enhancing nonlinear responses. In this work, by applying Fano resonances, we experimentally demonstrate efficient third-harmonic generation (THG) obtained with 2D silicon photonic crystal slabs (PCSs) thanks to the field enhancement in the dielectric layer. A 160-fold enhancement of THG is observed in the silicon PCS compared to the unpatterned silicon film. Through slightly changing the radius of the PCS, tunable THG on a single chip is obtained, paving a way for the optical manipulation of harmonic generation.
在共振光子纳米结构中，强光物质相互作用为增强非线性响应提供了机会。在这项工作中，我们通过应用 Fano 共振，实验证明了二维硅光子晶体平板（2D-Si-PCSs）在介质层中的场增强作用下，可以有效地产生三次谐波（3HG）。与无图案的硅膜相比，硅 PCS 的 3HG 增强了 160 倍。通过稍微改变 PCS 的半径，可以在单个芯片上获得可调谐的 3HG，为谐波产生的光学控制铺平了道路。
