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Giant Enhancement of Nonlinear Harmonic Generation in a Silicon Topological Photonic Crystal Nanocavity Chain
Author(s) -
Yuan Qingchen,
Gu Linpeng,
Fang Liang,
Gan Xuetao,
Chen Zhigang,
Zhao Jianlin
Publication year - 2022
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202100269
Subject(s) - photonic crystal , photonics , topology (electrical circuits) , optoelectronics , physics , second harmonic generation , silicon , coupling (piping) , nonlinear system , enhanced data rates for gsm evolution , materials science , optics , quantum mechanics , computer science , engineering , telecommunications , electrical engineering , laser , metallurgy
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.