Thermally switchable absorption in VO_2–graphene terahertz metamaterials enabled by machine learning optimization
- 影响因子：3.2
- DOI码：10.1007/s10971-025-06996-y
- 所属单位：西北大学电子信息学院
- 教研室：电子科学与技术系
- 发表刊物：Journal of Sol-Gel Science and Technology
- 刊物所在地：U.S.
- 项目来源：国际科技合作项目
- 关键字：Comprehensive optimization; Electric field loss; Machine learning optimization; Terahertz metamaterial absorber
Thermally switchable absorption; VO_2–graphene heterostructure
- 摘要：VO_2, a prototypical phase-change material, exhibits a reversible insulator-to-metal transition near 68 °C, accompanied by several orders of magnitude change in electrical conductivity while preserving structural integrity. Graphene, renowned for its tunable electronic properties and superior optical response, has emerged as a promising alternative to conventional periodic metal structures in metamaterials, or as an interfacial layer in composite devices. In this study, we integrate graphene and VO_2 into a multilayer heterostructured metamaterial absorber and incorporate machine learning techniques to optimize its geometric parameters, to achieve switchable high-performance absorption behavior. The designed absorber consists of a patterned metallic top layer, a graphene sheet, a VO_2-based functional layer, two dielectric layers, and a metallic aluminum ground plane. Leveraging the thermally induced phase transition of VO_2, the device enables dynamic switching of different absorption modes without changing its geometric shape and parameters. Specifically, in the metallic state of VO_2 (>68°C), the absorber demonstrates broadband absorption performance with an average absorption exceeding 90% across the 1.14–1.305 THz range. In contrast, when VO_2 is in its insulating state (<68 °C), the device exhibits triple band narrowband absorption with three sharp resonance peaks, achieving maximum absorptivities of 72%, 71%, and 99.7%, respectively. This work introduces a thermally switchable metamaterial absorber with fixed geometry, integrating VO_2 and graphene to achieve thermally switchable absorption behaviors, offering a practical solution for multifunctional terahertz applications.
- 论文类型：期刊论文
- 学科门类：工学
- 一级学科：电子科学与技术
- 文献类型：J
- 期号：116
- 页面范围：2654-2669
- 是否译文：否
- 发表时间：2025-10-25
- 收录刊物：SCI
- 发布期刊链接：https://link.springer.com/article/10.1007/s10971-025-06996-y
- 第一作者：Jiaxuan Xue
- 通讯作者：Cheng Chen*
- 合写作者：Shilei Tian
- 合写作者：Yvhang Wang
- 合写作者：Zihan Wang
- 合写作者：Jixin Wang
- 合写作者：Wu Zhao
- 合写作者：Zhiyong Zhang
- 合写作者：Johan Stiens
