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Twisted moiré photonic crystal enabled optical vortex generation through bound states in the continuum

Author

Listed:
  • Tiancheng Zhang

    (University of California)

  • Kaichen Dong

    (University of California
    Lawrence Berkeley National Laboratory
    Tsinghua University
    Tsinghua University)

  • Jiachen Li

    (University of California
    Lawrence Berkeley National Laboratory)

  • Fanhao Meng

    (University of California
    Lawrence Berkeley National Laboratory)

  • Jingang Li

    (University of California)

  • Sai Munagavalasa

    (University of California)

  • Costas P. Grigoropoulos

    (University of California)

  • Junqiao Wu

    (University of California
    University of California
    Lawrence Berkeley National Laboratory)

  • Jie Yao

    (University of California
    University of California
    Lawrence Berkeley National Laboratory)

Abstract

The twisted stacking of two layered crystals has led to the emerging moiré physics as well as intriguing chiral phenomena such as chiral phonon and photon generation. In this work, we identified and theoretically formulated a non-trivial twist-enabled coupling mechanism in twisted bilayer photonic crystal (TBPC), which connects the bound state in the continuum (BIC) mode to the free space through the twist-enabled channel. Moreover, the radiation from TBPC hosts an optical vortex in the far field with both odd and even topological orders. We quantitatively analyzed the twist-enabled coupling between the BIC mode and other non-local modes in the photonic crystals, giving rise to radiation carrying orbital angular momentum. The optical vortex generation is robust against geometric disturbance, making TBPC a promising platform for well-defined vortex generation. As a result, TBPCs not only provide a new approach to manipulating the angular momentum of photons, but may also enable novel applications in integrated optical information processing and optical tweezers. Our work broadens the field of moiré photonics and paves the way toward the novel application of moiré physics.

Suggested Citation

  • Tiancheng Zhang & Kaichen Dong & Jiachen Li & Fanhao Meng & Jingang Li & Sai Munagavalasa & Costas P. Grigoropoulos & Junqiao Wu & Jie Yao, 2023. "Twisted moiré photonic crystal enabled optical vortex generation through bound states in the continuum," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41068-1
    DOI: 10.1038/s41467-023-41068-1
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    References listed on IDEAS

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