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. 2023 Mar 7;12:66. doi: 10.1038/s41377-023-01090-w

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© The Author(s) 2023

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Fig. 2 — a Iso-frequency surface and color-mapped quality factor of the twisted PhCS. A symmetry-protected BIC is induced at Γ point. b Field distribution of the twisted PhCS at Γ point. c Left circular polarized field and d right circular polarized field at off−Γ point, showing the chiral features of the twisted PhCS