Generation of time-varying orbital angular momentum beams with space-time-coding digital metasurface

IF 18.8 1区物理与天体物理 Q1 OPTICS Advanced Photonics Pub Date : 2023-04-17 DOI:10.1117/1.AP.5.3.036001

Jingxin Zhang, Peixing Li, Ray C. C. Cheung, A. Wong, Jensen Li

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引用次数: 3

Abstract

Abstract. The recently proposed extreme-ultraviolet beams with time-varying orbital angular momentum (OAM) realized by high-harmonic generation provide extraordinary tools for quantum excitation control and particle manipulation. However, such an approach is not easily scalable to other frequency regimes. We design a space-time-coding digital metasurface operating in the microwave regime to experimentally generate time-varying OAM beams. Due to the flexible programmability of the metasurface, a higher-order twist in the envelope wavefront structure of time-varying OAM beams can be further designed as an additional degree of freedom. The time-varying OAM field patterns are dynamically mapped by developing a two-probe measurement technique. Our approach in combining the programmability of space-time-coding digital metasurfaces and the two-probe measurement technique provides a versatile platform for generating and observing time-varying OAM and other spatiotemporal excitations in general. The proposed time-varying OAM beams have application potentials in particle manipulation, time-division multiplexing, and information encryption.

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时变轨道角动量光束的时空编码数字超表面生成

摘要最近提出的利用高谐波产生实现时变轨道角动量的极紫外光束为量子激励控制和粒子操纵提供了非凡的工具。然而，这种方法不容易扩展到其他频率范围。我们设计了一个工作在微波环境下的时空编码数字超表面来实验产生时变的OAM波束。由于超表面具有灵活的可编程性，可以进一步设计时变OAM波束包络波前结构中的高阶扭曲作为额外的自由度。通过开发一种双探头测量技术，动态映射了时变OAM场模式。我们将时空编码数字元表面的可编程性与双探头测量技术相结合的方法为生成和观测时变OAM和其他时空激励提供了一个通用的平台。提出的时变OAM波束在粒子操纵、时分复用和信息加密等方面具有应用潜力。

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来源期刊

Advanced Photonics OPTICS-

CiteScore

22.70

自引率

1.20%

发文量

审稿时长

18 weeks

期刊介绍： Advanced Photonics is a highly selective, open-access, international journal that publishes innovative research in all areas of optics and photonics, including fundamental and applied research. The journal publishes top-quality original papers, letters, and review articles, reflecting significant advances and breakthroughs in theoretical and experimental research and novel applications with considerable potential. The journal seeks high-quality, high-impact articles across the entire spectrum of optics, photonics, and related fields with specific emphasis on the following acceptance criteria: -New concepts in terms of fundamental research with great impact and significance -State-of-the-art technologies in terms of novel methods for important applications -Reviews of recent major advances and discoveries and state-of-the-art benchmarking. The journal also publishes news and commentaries highlighting scientific and technological discoveries, breakthroughs, and achievements in optics, photonics, and related fields.

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