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

Yafeng Chen, Zhihao Lan, Jensen Li, and Jie Zhu
Phys. Rev. B 104, 155421 – Published 15 October 2021
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Abstract

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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  • Received 23 June 2021
  • Revised 29 September 2021
  • Accepted 5 October 2021

DOI:https://doi.org/10.1103/PhysRevB.104.155421

©2021 American Physical Society

Physics Subject Headings (PhySH)

Interdisciplinary Physics

Authors & Affiliations

Yafeng Chen1,2,*, Zhihao Lan3,*,†, Jensen Li4, and Jie Zhu5,‡

  • 1State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan 410082, China
  • 2Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong SAR 999077, China
  • 3Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, United Kingdom
  • 4Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, China
  • 5Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China

  • *These authors contributed equally to this work.
  • z.lan@ucl.ac.uk
  • jiezhu@tongji.edu.cn

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Issue

Vol. 104, Iss. 15 — 15 October 2021

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