Bright Second Harmonic Emission from Photonic Crystal Vertical Cavity
Lun Qu, Zhidong Gu, Chenyang Li, Yuan Qin, Yiting Zhang, Di Zhang, Jiaxian Zhao, Qiang Liu, Chunyan Jin, Lishuan Wang, Wei Wu, Wei Cai, Huasong Liu, Mengxin Ren, Jingjun Xu
Abstract
Abstract This study presents photonic vertical cavities consisting of nonlinear materials embedded in photonic crystals (PhCs) for resonantly enhancing second harmonic generation (SHG). Previous attempts at SHG in such structures have been limited to efficiencies of 10 −7 to 10 −5 , but a high SHG efficiency of 0.28% by constructing a vertical cavity with a lithium niobate membrane placed between two PhCs is demonstrated, which exhibits high‐quality resonances. The results open up new possibilities for compact laser frequency converters that can have a revolutionary impact on the fields of nonlinear optics and photonics.