Metasurface based on VO2-Ge2Sb2Te5 with multi-modes: cross-polarization conversion, reversible linear dichroism and absorption

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-04-17 DOI:10.1016/j.optcom.2025.131895

Xinhui Lu, Lei Yang, Weiyi Peng, Xiaohui Yang

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引用次数: 0

Abstract

To address the limitations of conventional metasurfaces, including single-function operation, structural complexity, and narrow application scope, we propose a VO₂-Ge₂Sb₂Te₅ (GST225)-based multifunctional switchable terahertz metasurface. By utilizing the unique properties of the two phase-change materials (PCMs) and controlling their phase transitions, the metasurface dynamically switches between three functional modes: cross-polarization conversion, reversible linear dichroism (LD), and absorption. The polarization conversion mode achieves over 90% efficiency in the 2.52–3.92 THz range and exhibits incident polarization insensitivity. The reversible LD mode enables switching between dichroism values of +0.956 and −0.959 at 1.57 THz through actively controlled PCMs. The absorption mode demonstrates broadband performance, maintaining over 60% absorption rate across a 4 THz bandwidth and exhibiting dual-peak spectral characteristics. Leveraging these operational modes, we introduce three distinct encryption schemes. The proposed metasurface serves as a versatile integration platform, offering potential applications in polarization detection and image encryption.

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针对传统元表面功能单一、结构复杂、应用范围窄等局限性，我们提出了一种基于 VO2-Ge2Sb2Te5 (GST225) 的多功能可切换太赫兹元表面。通过利用两种相变材料（PCM）的独特性质并控制它们的相变，元表面可在三种功能模式之间动态切换：交叉偏振转换、可逆线性二色性（LD）和吸收。偏振转换模式在 2.52-3.92 太赫兹范围内的效率超过 90%，并且对入射偏振不敏感。通过主动控制 PCM，可逆 LD 模式可在 1.57 THz 的 +0.956 和 -0.959 分色值之间切换。吸收模式具有宽带性能，在 4 太赫兹带宽内保持 60% 以上的吸收率，并表现出双峰值光谱特性。利用这些工作模式，我们引入了三种不同的加密方案。所提出的元表面是一个多功能集成平台，在偏振检测和图像加密方面具有潜在的应用价值。

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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.