High efficiency & ultra-wideband polarization rotator metasurface for THz waves

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-05-11 DOI:10.1016/j.optcom.2025.131931

Aalolika Roy Chowdhury , Md. Shahriar Hasan , A.K.M. Baki

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引用次数: 0

Abstract

The terahertz (THz) spectrum holds a notable prospect for the growth of 6G wireless technologies due to its higher frequency and excellent sensing abilities. Photonics-based research requires a highly efficient THz polarization converter that possesses both wide bandwidth and high conversion efficiency. In this paper, a novel hexagonal crescent-shaped polarization converter metasurface (HCPCM) is presented that operates within the frequency range of 1.27 to 3.93 THz. The unit cell exhibits a fractional bandwidth of 102.31% (at -10 dB), establishing an ultra-wideband response within the operating frequency band. Efficient cross-polarization conversion takes place at the four plasmonic resonances of 1.35 THz, 1.92 THz, 3.04 THz, and 3.8 THz as Polarization Conversion Ratio (PCR) reaches 100% at these frequencies for normal incidence. Furthermore, HCPCM demonstrates angular stability up to an incidence angle of 35

°

, holding PCR above 80% at all resonant frequencies. These features make HCPCM suitable for several applications, including High-Speed Wireless Communication, Medical Imaging, Spectroscopy, and Environmental Monitoring. Theoretical research, as well as comprehensive 3D full-wave simulations, affirmed the efficacy of the proposed design in this paper.

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用于太赫兹波的高效超宽带偏振旋转器超表面

太赫兹（THz）频谱由于其更高的频率和出色的传感能力，在6G无线技术的发展中具有显著的前景。基于光子学的研究需要一种既具有宽带宽又具有高转换效率的高效太赫兹偏振变换器。本文提出了一种新型的六角形月牙形偏振变换器超表面（HCPCM），其工作频率范围为1.27 ~ 3.93太赫兹。该单晶胞显示102.31%的分数带宽（在-10 dB），在工作频带内建立了超宽带响应。在1.35 THz、1.92 THz、3.04 THz和3.8 THz四个等离子体共振频率下，极化转化率（PCR）达到100%，实现了高效的交叉极化转换。此外，HCPCM的角度稳定性可达35°入射角，在所有谐振频率下均保持80%以上的PCR。这些特点使HCPCM适用于多种应用，包括高速无线通信，医学成像，光谱学和环境监测。理论研究和全面的三维全波仿真验证了本文设计的有效性。

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 Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.