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Data from: Strong interlayer coupling and chiral flat-band cascades in twisted bilayer gratings

Choi, Daegwang12; Lee, Soon-Jae1; Cho, Seung-Woon1; Bark, Chan Bin3; Pak, Seik3; Shin, Dong-Jin1; Park, Moon Jip3; Gong, Su-Hyun1

Published Jul 28, 2026 on Dryad. https://doi.org/10.5061/dryad.fxpnvx16v

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Jul 28, 2026 version files 312.02 MB

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Abstract

From atomic crystals to macroscopic material structures, twisted bilayer systems have emerged as a promising route to control wave phenomena. In few-layer van der Waals (vdW) materials, however, the intrinsically weak interlayer coupling typically demands fine control of small twist angles to reach magic-angle conditions. Here, we show that one-dimensional photonic crystal bilayers can overcome this limitation by accessing a regime of strong interlayer coupling—comparable to intralayer coupling. This strong coupling enables flat-band formation over a broad angular range even at large twist angles. We experimentally realize this regime by stacking WS₂ gratings via a two-step lithography method, yielding ultra-wide chiral flat-band cascades in magic-angle twisted bilayer gratings. Our work not only provides a platform for designing photonic applications with a tunable localization but also explores a new regime of physics that is unattainable in conventional solid-state-based moiré systems.