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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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.