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Brillouin zone folding driven bound states in the continuum

Author

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  • Wenhao Wang

    (University of Electronic Science and Technology of China
    Nanyang Technological University
    Nanyang Technological University)

  • Yogesh Kumar Srivastava

    (Nanyang Technological University
    Nanyang Technological University
    Sangareddy)

  • Thomas CaiWei Tan

    (Nanyang Technological University
    Nanyang Technological University)

  • Zhiming Wang

    (University of Electronic Science and Technology of China)

  • Ranjan Singh

    (Nanyang Technological University
    Nanyang Technological University)

Abstract

Non-radiative bound states in the continuum (BICs) allow construction of resonant cavities with confined electromagnetic energy and high-quality (Q) factors. However, the sharp decay of the Q factor in the momentum space limits their usefulness for device applications. Here we demonstrate an approach to achieve sustainable ultrahigh Q factors by engineering Brillouin zone folding-induced BICs (BZF-BICs). All the guided modes are folded into the light cone through periodic perturbation that leads to the emergence of BZF-BICs possessing ultrahigh Q factors throughout the large, tunable momentum space. Unlike conventional BICs, BZF-BICs show perturbation-dependent dramatic enhancement of the Q factor in the entire momentum space and are robust against structural disorders. Our work provides a unique design path for BZF-BIC-based silicon metasurface cavities with extreme robustness against disorder while sustaining ultrahigh Q factors, offering potential applications in terahertz devices, nonlinear optics, quantum computing, and photonic integrated circuits.

Suggested Citation

  • Wenhao Wang & Yogesh Kumar Srivastava & Thomas CaiWei Tan & Zhiming Wang & Ranjan Singh, 2023. "Brillouin zone folding driven bound states in the continuum," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38367-y
    DOI: 10.1038/s41467-023-38367-y
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    References listed on IDEAS

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    4. Jicheng Jin & Xuefan Yin & Liangfu Ni & Marin Soljačić & Bo Zhen & Chao Peng, 2019. "Topologically enabled ultrahigh-Q guided resonances robust to out-of-plane scattering," Nature, Nature, vol. 574(7779), pages 501-504, October.
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