Topologically protected second harmonic generation via doubly resonant high-order photonic modes

  title={Topologically protected second harmonic generation via doubly resonant high-order photonic modes},
  author={Yafeng Chen and Zhihao Lan and Jensen Li and Jie Zhu},
  journal={Physical Review B},
Topology-driven nonlinear light-matter effects open up new paradigms for both topological photonics and nonlinear optics. Here, we propose to achieve high-efficiency second harmonic generation in a second-order photonic topological insulator. Such a system hosts highly localized topological corner states with large quality factors for both fundamental and second harmonic waves, which could be matched perfectly in frequency by simply tuning the structural parameters. Through the nonlinear… 

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