Li Zhi, Liu Wenwei, Li Zhancheng, Cheng Hua, Chen Shuqi, Tian Jianguo
Opt Lett. 2017 Aug 15;42(16):3117-3120. doi: 10.1364/OL.42.003117.
Plasmonic nanostructures have been considered as potential candidates for enhancing the nonlinear upconversion rate at nanoscale levels due to their strong near-field enhancement. Here, we propose a Fano-resonance-based mode-matching hybrid metasurface that combines the advantages of Fano resonances and mode-matching for boosting second-harmonic conversion. A confined and strong near-field intensity is generated by gold nanoantennas within the volume of polycrystalline zinc sulfide nanoparticles, thus resulting in a larger effective second-harmonic coefficient. The combination of the abovementioned features allows for the realization of a second-harmonic generation (SHG) conversion efficiency of 5.55×10, and the SHG signal is twice that obtained with dipole hybrid metasurfaces. Our designed metasurface may pave the way for optimizing nonlinear light-matter interactions at the nanoscale.
由于其强大的近场增强效应，等离子体纳米结构被认为是在纳米尺度上提高非线性上转换速率的潜在候选者。在此，我们提出一种基于法诺共振的模式匹配混合超表面，它结合了法诺共振和模式匹配的优点来提高二次谐波转换效率。多晶硫化锌纳米颗粒体积内的金纳米天线产生了受限且强烈的近场强度，从而导致更大的有效二次谐波系数。上述特征的结合实现了5.55×10的二次谐波产生（SHG）转换效率，并且SHG信号是偶极子混合超表面所获得信号的两倍。我们设计的超表面可能为优化纳米尺度上的非线性光与物质相互作用铺平道路。
