Experimental probe of twist angle–dependent band structure of on-chip optical bilayer photonic crystal

• DOI: 10.1126/sciadv.adh8498
• Publication Date: 2023-07-12T17:58:38Z
• Authors: Haoning Tang; Beicheng Lou; Fan Du; Mingjie Zhang; Xueqi Ni; Weijie Xu; Rebekah Jin; Shanhui Fan; Eric Mazur

Recently, twisted bilayer photonic materials have been extensively used for creating and studying tunability through interlayer couplings. While experimentally demonstrated in microwave regimes, a robust platform measuring optical frequencies has elusive. Here, we demonstrate the first on-chip crystal with twist angle-tunable dispersion great simulation-experiment agreement. Our results reveal highly tunable band structure of crystals due to moiré scattering. This work opens door realizing unconventional properties novel applications frequency regimes.