Alternative Design of Dammann Grating for Beam Splitting With Adjustable Zero-Order Light Intensity
Alternative Design of Dammann Grating for Beam Splitting With Adjustable Zero-Order Light Intensity
复制标题
零级光强可调的分束达曼光栅的替代设计
DOI：
10.1109/jphot.2019.2899903
复制
发表时间：
2019-04-01
影响因子：
2.4
通讯作者：
Deng, Qiling
中科院分区：
文献类型：
--
作者：
Pang, Hui;Cao, Axiu;Deng, Qiling
传统的达曼光栅是一种双相位（0，π）透射光栅，能够将入射激光束分成多个强度相等的出射光束。本文提出了一种非π相移的达曼型分束器的设计方案。在设计中，采用模拟退火算法同时优化光栅结构和相位差。我们发现这种非0-π相位光栅具有一些有趣的性质。当刻蚀深度略低于理论深度时，零级光强相对于其他衍射级有所增强。相反，当蚀刻深度略大于理论深度时，零级光强度衰减。这允许我们灵活地调整零级衍射光的亮度。相比之下，对于传统的达曼光栅，蚀刻深度的偏差将总是导致更亮的零级光。仿真和实验验证了该光栅的可行性。
Conventional Dammann grating is a binary-phase (0, π) transmission grating capable of splitting an incoming laser beam into multiple outgoing beams with equal intensity. In this paper, we present an alternative design for Dammann-type beamsplitter with a non π-phase shift value. In the design, the simulated annealing algorithm is taken to optimize the grating structure and phase difference simultaneously. We find that this non 0-π phase grating exhibits interesting properties. When the etching depth is slightly lower than the theoretical depth, the zero-order light intensity is enhanced compared to other diffraction orders. Conversely, when the etching depth is slightly greater than the theoretical depth, the zero-order light intensity is attenuated. This allows us to flexibly adjust the brightness of the zero-order diffractive light. In contrast, the deviation of the etching depth will always result in a brighter zero-order light for the conventional Dammann grating. Simulations and experiments are performed to verify the feasibility of the proposed grating.