volume | PIER Journals

Abstract

This paper presents a switchable terahertz metamaterial device based on vanadium dioxide (VO₂). By leveraging its phase transition properties, the device achieves broadband absorption and polarization conversion functionality through the insulator-to-metal transition (IMT) induced by temperature modulation. When VO₂ is metallic, the device functions as a broadband absorber. achieving an absorption rate exceeding 90% within the frequency range of 2.2 to 4.4 THz. Conversely, when VO₂ is in its insulating state, the device enables polarization conversion of incident terahertz waves. Simulation results reveal that in this state, the cross-polarized reflection coefficient (Ryx) exceeds 0.8, while the co-polarized reflection coefficient (Rxx) is significantly suppressed, indicating efficient conversion from co-polarization to cross-polarization within the 1.4 to 2.1 THz range. Notably, the polarization conversion rate approaches unity in this frequency band. Additionally, the study investigates the influence of the structure's geometric parameters, incident angle, and polarization angle on its performance. The results highlight the device's robust tolerance to variations in these parameters, as well as its low manufacturing precision requirements. The proposed multifunctional switchable terahertz metamaterial device holds significant potential for applications in terahertz research, polarization filtering, and terahertz invisibility technologies.

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Dr. Fang Wang

Mr. Junjie Cui

Ms. Hua Liu

Mr. Tao Ma

Dr. Xu Wang

Professor Yufang Liu