Lu Jindong, Chen Guanyu, Su Wenqu, Li Haibo, Gu Xiaowen, Yu Hua
Opt Express. 2025 Jun 30;33(13):28226-28232. doi: 10.1364/OE.565933.
We propose and demonstrate a high-performance suspended grating coupler on ultra-thin X-cut lithium niobate on insulator (LNOI) for fully-etched photonic devices. The optimized design achieves exceptional coupling efficiency (-3.5 dB at 1546.24 nm), a broad bandwidth (1 dB bandwidth of 70 nm and 3 dB bandwidth exceeding 90 nm), and robust fabrication tolerance. This work addresses a critical challenge in integrated photonics by enabling efficient grating couplers on ultra-thin LNOI platforms, thereby providing a practical and scalable solution for coupling light into photonic crystal waveguides and other suspended photonic devices.
我们提出并展示了一种用于全蚀刻光子器件的高性能悬浮光栅耦合器，该耦合器基于超薄X切绝缘体上铌酸锂（LNOI）。优化设计实现了卓越的耦合效率（在1546.24nm处为-3.5dB）、宽带宽（1dB带宽为70nm，3dB带宽超过90nm）以及强大的制造容差。这项工作通过在超薄LNOI平台上实现高效光栅耦合器，解决了集成光子学中的一个关键挑战，从而为将光耦合到光子晶体波导和其他悬浮光子器件中提供了一种实用且可扩展的解决方案。
