Broadband terahertz metasurface for multi-functional manipulation based on Ge2Sb2Te5

IF 3.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2026-04-01 Epub Date: 2026-03-27 DOI:10.1016/j.photonics.2026.101543

Dongming Liu , Fengye Zhang , Tingting Lv , Jian Han , Jinhui Shi

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引用次数: 0

Abstract

Terahertz metasurfaces provide a compact platform for miniaturizing optical systems, holding significant importance in 6 G communication, imaging, and information processing. Here, we propose that a periodic metasurface achieves switching between broadband half-wave plate and broadband absorption by leveraging Ge₂Sb₂Te₅ (GST) phase transition. Furthermore, phase-gradient metasurfaces are designed through the geometric phase principle. The linear phase distribution design enables a switchable effect between anomalous reflection within the 3.8–6.6 THz frequency band and broadband absorption across the 2.7–8.5 THz band. Notably, the metasurface can support a wide angular range of up to 60° for efficient anomalous reflection. The orbital angular momentum (OAM) metasurface with a helical phase distribution exhibits dual broadband vortex beams in terms of l= -1, with a maximum purity of 0.964. The proposed multifunctional metasurfaces provide a robust solution for realizing compact and integrated terahertz architectures.

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基于Ge2Sb2Te5的宽带太赫兹多功能操纵元表面

太赫兹超表面为光学系统的小型化提供了一个紧凑的平台，在6 G通信、成像和信息处理中具有重要意义。在这里，我们提出了一种周期性的超表面，通过利用Ge₂Sb₂Te5 （GST）相变来实现宽带半波片和宽带吸收之间的切换。在此基础上，利用几何相位原理设计了相梯度超表面。线性相位分布设计实现了3.8-6.6 太赫兹频段内的异常反射和2.7-8.5 太赫兹频段的宽带吸收之间的切换效果。值得注意的是，超表面可以支持高达60°的宽角范围，以实现有效的异常反射。螺旋相位分布的轨道角动量（OAM）超表面呈现出l= -1的双宽带涡旋光束，最大纯度为0.964。提出的多功能元表面为实现紧凑和集成的太赫兹架构提供了一个健壮的解决方案。

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来源期刊

Photonics and Nanostructures-Fundamentals and Applications 工程技术-材料科学：综合

CiteScore

5.00

自引率

3.70%

发文量

审稿时长

62 days

期刊介绍： This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.