Zheng Xiaoran, Yang Jiaqi, Wang Runqiu, Lan Tian
Appl Opt. 2022 Mar 20;61(9):2184-2191. doi: 10.1364/AO.448192.
Dammann gratings (DGs) can generate a spot array in a particular arrangement. In recent years, DGs have been used in many fields such as laser beam splitting and optical coupling. Nanograting encoding technology can achieve a high signal-to-noise ratio and high-efficiency diffraction distribution; it also provides new design ideas for realizing the miniaturization and deviceization of DGs. In this work, we have comprehensively studied the DG based on an all-dielectric metasurface, which can produce a 5×5 diffraction spot array with a diffraction angle of 20×20. In an operation waveband from 650 to 690 nm, the DG has superior performance with high efficiency ≥60; meanwhile, it achieves a relative low contrast ratio ≤0.33. Owing to high efficiency, wide waveband performance, and polarization insensitive property, the all-dielectric metasurface DG can provide possibilities for various application, including laser technology and optical information processing.
达曼光栅（DGs）可以产生特定排列的光斑阵列。近年来，达曼光栅已被应用于许多领域，如激光束分裂和光耦合。纳米光栅编码技术可以实现高信噪比和高效衍射分布；它还为实现达曼光栅的小型化和器件化提供了新的设计思路。在这项工作中，我们全面研究了基于全介质超表面的达曼光栅，它可以产生一个5×5的衍射光斑阵列，衍射角为20×20。在650至690nm的工作波段内，该达曼光栅具有优异的性能，效率≥60%；同时，它实现了相对较低的对比度≤0.33。由于具有高效率、宽波段性能和偏振不敏感特性，全介质超表面达曼光栅可为包括激光技术和光信息处理在内的各种应用提供可能性。
