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2026-06-12
Broadband and Switchable VO2-Based BI-Functional THz Polarization Converter Combined with a Deep-Learning-Assisted Design Method
By
Progress In Electromagnetics Research M, Vol. 138, 55-64, 2026
Abstract
This study presents a broadband, switchable, and bi-functional terahertz device based on the phase transition of vanadium dioxide (VO2). When VO2 is in the metallic state, the device operates as a linear polarization converter (LPC). When VO2 transitions to the insulating state, the device functions as a broadband linear-to-circular polarization converter (LTC-PC). Numerical simulations are conducted to verify the device performance. To further optimize metamaterial performance and accelerate the design process, a deep learning framework that integrates convolutional neural networks (CNNs) and the Transformer architecture via an adaptive mechanism is proposed. Numerical simulations indicate that this LPC achieves a polarization conversion ratio (PCR) exceeding 90% across the 1.92-2.93 THz band and maintains angular stability for incidence angles up to 50°. The LTC-PC operates effectively within the 2.40-4.33 THz range. Featuring broadband operation and bi-functional capabilities, the converter holds significant potential for applications in terahertz imaging, sensing, solar energy harvesting, and communications.
Citation
Haohan Xie, Shuning Wei, Wenting Qu, Xinlei Zhang, Chenshan Le, Jinlin Li, and Jun Dong, "Broadband and Switchable VO2-Based BI-Functional THz Polarization Converter Combined with a Deep-Learning-Assisted Design Method," Progress In Electromagnetics Research M, Vol. 138, 55-64, 2026.
doi:10.2528/PIERM26032606
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