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Enhanced wide-angle third-harmonic generation in flat-band-engineered quasi-BIC metagratings

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Abstract

Nonlinear metasurfaces and photonic crystals provide a significant way to generate and manipulate nonlinear signals owing to the resonance- and symmetry-based light-matter interactions supported by the artificial structures. However, the nonlinear conversion efficiency is generally limited by the angular dispersion of optical resonances especially in nonparaxial photonics. Here, we propose a metagrating realizing a quasi-bound-state in the continuum in a flat band to dramatically improve the third harmonic generation (THG) efficiency. A superior operating angular range is achieved based on the interlayer and intralayer couplings, which are introduced by breaking the mirror symmetry of the metagrating. We demonstrate the relation of angular dispersion between the nonlinear and linear responses at different incident angles. We also elucidate the mechanism of these off-axis flat-band-based nonlinear conversions through different mode decomposition. Our scheme provides a robust and analytical way for nonparaxial nonlinear generation and paves the way for further applications such as wide-angle nonlinear information transmission and enhanced nonlinear generation under tight focusing.

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Authors and Affiliations

  1. The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300071, China

    Yijia Zang, Ruoheng Chai, Wenwei Liu, Zhancheng Li, Hua Cheng, Jianguo Tian & Shuqi Chen

  2. School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Nankai University, Tianjin, 300350, China

    Shuqi Chen

  3. The Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China

    Shuqi Chen

Authors
  1. Yijia Zang
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  2. Ruoheng Chai
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  3. Wenwei Liu
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  4. Zhancheng Li
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  5. Hua Cheng
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  6. Jianguo Tian
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  7. Shuqi Chen
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Corresponding authors

Correspondence to Wenwei Liu, Hua Cheng or Shuqi Chen.

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Conflict of interest The authors declare that they have no conflict of interest

Additional information

This work was supported by the National Key Research and Development Program of China (Grant Nos. 2021YFA1400601, and 2022YFA1404501), the National Natural Science Fund for Distinguished Young Scholar (Grant No. 11925403), and the National Natural Science Foundation of China (Grant Nos. 12122406, 12192253, 12274239, 12274237, and U22A20258).

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The supporting information is available online at http://phys.scichina.com and https://link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Zang, Y., Chai, R., Liu, W. et al. Enhanced wide-angle third-harmonic generation in flat-band-engineered quasi-BIC metagratings. Sci. China Phys. Mech. Astron. 67, 244212 (2024). https://doi.org/10.1007/s11433-023-2299-9

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  • DOI: https://doi.org/10.1007/s11433-023-2299-9

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