Gradient moiré perovskite superlattices for laser beam steering

作者：Nanli Mou, Bing Tang, Delin Zhang, Jingyue Yu, Mou Zhong, Zichun Bai, Xiaolu Zhuo, Biye Xie, Zhaoyu Zhang, Shikai Deng, Andrey L. Rogach, Jingtian Hu, Jun Guan · 发表于：Science Advances · 年份：2025 · DOI：10.1126/sciadv.adz8028 · 被引用次数：6 · 研究领域：Strong Light-Matter Interactions、Mechanical and Optical Resonators、Nonlinear Photonic Systems

Manipulation of laser emission characteristics plays a key role in diverse technologies. However, compact lasers with internal beam steering functionalities remain a challenge. Here, we demonstrate how gradient moiré perovskite superlattices can facilitate dynamic laser beam steering. By combining a two-dimensional (2D) square lattice with a globally curved 1D perovskite grating, we fabricated gradient moiré photonic superlattices with continuously variable twist angles. We revealed how the moiré interlayer coupling at the high-symmetry points on the Brillouin zone boundaries can produce additional cavity modes with twist angle-controlled wave vectors. We showed that the moiré-induced band-edge modes can support lasing with low thresholds. By sweeping the pump area to access different twist angles, we achieved tuning of laser emission angles in a continuous and wide range (>30°) from a single device. Our work provides a highly tunable platform for moiré-induced light-matter interactions, which opens prospects for programmable and intelligent photonic technologies.