Orbital momentum mode generation by a tunable diffractive optical element based on lithium niobate

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2024-11-01 DOI:10.1016/j.optmat.2024.116401

Alexander Esin , Andrey Akhmatkhanov , Vladimir Pavelyev , Vladimir Shur

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Abstract

Tunable LiNbO₃-based diffractive optical elements (DOEs) to control orbital angular momentum spectrum of the beam are proposed. Tunable binary spiral axicons for generation of the beam with orbital angular momentum (topological charge l = 1) are fabricated and investigated experimentally by optical methods. The intensity distribution in the far field under a half-wave voltage (3400 V) applied to the DOE was in good agreement with the theoretical prediction. It was shown that utilization of two oppositely-rotating DOEs leads to appearance of a correlation peak, thus demonstrating ability to realize the correlation filtration for orbital momentum mode detection in telecommunication system. The response time of the DOEs was evaluated using an element designed for generating a TEM01 mode and fabricated by the same technology. The measured response time below 200 ns was limited by the bandwidth of the used photodiode. The proposed elements can be used in optical telecommunication systems with mode division multiplexing.

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基于铌酸锂的可调谐衍射光学元件产生轨道动量模式

提出了可调谐的基于氧化铌酸锂的衍射光学元件（DOE）来控制光束的轨道角动量谱。通过光学方法制作并实验研究了用于产生轨道角动量（拓扑电荷 l = 1）光束的可调二元螺旋轴子。在对 DOE 施加半波电压（3400 V）的情况下，远场的强度分布与理论预测非常吻合。实验表明，利用两个相对旋转的 DOE 可以产生一个相关峰，从而证明了在电信系统中实现轨道动量模式检测的相关过滤能力。利用为产生 TEM01 模式而设计并采用相同技术制造的元件，对 DOE 的响应时间进行了评估。测得的响应时间低于 200 ns，但受到所用光电二极管带宽的限制。所提出的元件可用于具有模分复用功能的光通信系统。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.