期刊
PHYSICAL REVIEW B
卷 104, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.155421
关键词
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资金
- National Natural Science Foundation of China [1210020421]
- Hong Kong Scholars Program [XJ2020004]
- Research Grants Council of Hong Kong SAR [AoE/P-502/20]
The proposal suggests achieving high-efficiency second harmonic generation in a second-order photonic topological insulator by tuning structural parameters. Unprecedented frequency conversion efficiency is predicted through the nonlinear interaction of the doubly resonant topological corner states, while also demonstrating the robustness of the nonlinear process against defects. This work opens up avenues for topologically protected nonlinear frequency conversion using high-order photonic topological modes.
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 interaction of the doubly resonant topological corner states, unprecedented frequency conversion efficiency is predicted. In addition, the robustness of the nonlinear process against defects is also demonstrated. Our work opens up avenues toward topologically protected nonlinear frequency conversion using high-order photonic topological modes.
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