Giant Enhancement of Nonlinear Harmonic Generation in a Silicon Topological Photonic Crystal Nanocavity Chain. Issue 5 (5th February 2022)

• Record Type: Journal Article
• Authors: Yuan, Qingchen; Gu, Linpeng; Fang, Liang; Gan, Xuetao; Chen, Zhigang; Zhao, Jianlin
• Is Part Of: Laser & photonics reviews. Volume 16:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-05
• Subjects: photonic crystal nanocavities -- Su‐Schrieffer‐Heeger model -- third harmonic generation -- topological photonics; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202100269
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: Strongly enhanced third‐harmonic generation (THG) by the topological localization of an edge mode in a Su‐Schrieffer‐Heeger (SSH) chain of silicon photonic crystal nanocavities is demonstrated. The edge mode of the nanocavity chain not only naturally inherits resonant properties of the single nanocavity, but also exhibits the topological feature with mode robustness extending well beyond individual nanocavity. By engineering the SSH nanocavities with alternating strong and weak coupling strengths on a silicon slab, the edge mode formation that entails a strong THG signal similar to that obtained from a single nanocavity is observed, which both show three orders of magnitude enhancement compared with that in a trivial SSH structure. The results indicate that the photonic crystal nanocavity chain can provide a promising on‐chip platform for topology‐driven nonlinear photonics. Abstract : Strongly enhanced third‐harmonic generation (THG) by the topological localization of an edge mode in a Su‐Schrieffer‐Heeger (SSH) chain of silicon photonic crystal nanocavities is demonstrated. The edge mode entails a strong THG signal similar to that obtained from a single nanocavity, which both show three orders of magnitude enhancement compared with that in a trivial SSH structure.