Terahertz flat-top beam generation via triple-polarization-channel multiplexed metasurface

IF 3.7 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2025-09-16 DOI:10.1016/j.optlaseng.2025.109357

Jieyang Tang , Jierong Cheng , Shengjiang Chang

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引用次数: 0

Abstract

Different from laser sources, terahertz emitters typically generate beams with spatial inhomogeneity and small aperture size due to limited power. This can limit system performance in applications such as imaging. Optical components for beam shaping are highly desirable. Leveraging metasurfaces' versatile wavefront manipulation capabilities and a non-orthogonal polarization multiplexing strategy, we demonstrate the simultaneous generation of terahertz flat-top beams in three distinct polarization channels. Specifically, circular, rectangular, and square beam profiles are achieved in the x-polarized, 45°, and y-polarized channels, respectively. By implementing the Gerchberg-Saxton angular spectrum iterative algorithm and constructing a full-parameter Jones matrix model, the generated flat-top beams with negligible crosstalk exhibit remarkable improvements in both intensity uniformity and edge steepness compared to the original terahertz source. These advancements enable precise radiation pattern engineering, addressing critical requirements across diverse terahertz applications.

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通过三极化通道复用超表面产生太赫兹平顶波束

与激光光源不同，太赫兹发射器由于功率有限，产生的光束具有空间不均匀性和小孔径。这可能会限制成像等应用中的系统性能。用于光束整形的光学元件是非常需要的。利用超表面的多用途波前操作能力和非正交极化复用策略，我们展示了在三个不同的极化通道中同时产生太赫兹平顶波束。具体来说，在x偏振、45°和y偏振通道中分别实现了圆形、矩形和方形光束轮廓。通过实现Gerchberg-Saxton角谱迭代算法和构建全参数Jones矩阵模型，生成的串扰可忽略的平顶光束在强度均匀性和边缘陡度方面都比原始太赫兹源有显著改善。这些进步实现了精确的辐射模式工程，解决了各种太赫兹应用的关键要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques