School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
Department of Applied Physics and Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA.
Sci Adv. 2023 Jul 14;9(28):eadh8498. doi: 10.1126/sciadv.adh8498. Epub 2023 Jul 12.
Recently, twisted bilayer photonic materials have been extensively used for creating and studying photonic tunability through interlayer couplings. While twisted bilayer photonic materials have been experimentally demonstrated in microwave regimes, a robust platform for experimentally measuring optical frequencies has been elusive. Here, we demonstrate the first on-chip optical twisted bilayer photonic crystal with twist angle-tunable dispersion and great simulation-experiment agreement. Our results reveal a highly tunable band structure of twisted bilayer photonic crystals due to moiré scattering. This work opens the door to realizing unconventional twisted bilayer properties and novel applications in optical frequency regimes.
最近，扭曲双层光子材料在通过层间耦合来实现和研究光子可调谐性方面得到了广泛的应用。虽然扭曲双层光子材料在微波频段已经得到了实验验证，但在实验测量光频方面仍缺乏稳健的平台。在这里，我们展示了第一个具有可调转角色散的片上光学扭曲双层光子晶体，并且模拟与实验结果吻合得很好。我们的结果揭示了由于莫尔散射，扭曲双层光子晶体具有高度可调谐的能带结构。这项工作为实现非常规的扭曲双层性质以及在光频领域的新应用开辟了道路。
