Full-space orbital angular momentum generation using transmission-reflection-integrated coding metasurface

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik Pub Date : 2025-03-07 DOI:10.1016/j.ijleo.2025.172308

Seyed Abolfazl Hosseini, Sahar Solati Masouleh, Mohammad Yazdi

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引用次数: 0

Abstract

This study introduces an innovative design for transmission-reflection-integrated (TRI) space-coding metasurfaces, capable of generating high-purity orbital angular momentum (OAM) modes in the far-field and focusing lenses in the near-field within the same frequency band. The metasurfaces combine reflective and transmissive unit cells—gold patches on Teflon substrates—using a novel spatial coding scheme to create a unified structure. Various arrangements were explored and compared, demonstrating the metasurface's ability to simultaneously reflect and transmit OAM waves with high mode purity (undesired modes below 20 %) and focus waves with a narrow full-width half-maximum (FWHM) of less than 0.37 mm. Simulated at 0.662 THz, the design is adaptable to other frequency bands. The study outlines the design methodology, unit cell specifications, and analytical formulations, validated by full-wave simulations. These results underscore the potential of TRI coding metasurfaces for advanced electromagnetic wave control, with applications in wireless communication and wireless power transfer systems.

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利用透射-反射-集成编码超表面生成全空间轨道角动量

本研究提出了一种创新的透射-反射集成（TRI）空间编码超表面设计，能够在同一频带内产生远场高纯度轨道角动量（OAM）模式和近场聚焦透镜。超表面结合了反射和透射单元细胞——聚四氟乙烯基板上的金块——使用一种新的空间编码方案来创建一个统一的结构。对各种排列进行了探索和比较，证明了超表面能够同时反射和传输高模式纯度（不希望的模式低于20% %）的OAM波和窄全宽半最大值（FWHM）小于0.37 mm的聚焦波。该设计在0.662 太赫兹下进行仿真，适用于其他频段。该研究概述了设计方法、单元规格和分析公式，并通过全波模拟进行了验证。这些结果强调了TRI编码元表面在先进电磁波控制方面的潜力，以及在无线通信和无线电力传输系统中的应用。

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

Optik 物理-光学

CiteScore

6.90

自引率

12.90%

发文量

1471

审稿时长

46 days

期刊介绍： Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.