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基于各向异性超材料，设计并制备了一种工作于太赫兹波段的宽带高效率的透射式线性偏振转换器。通过对其感应的表面电流分析，阐明了实现高效宽带转换的物理机制主要归因于三种不同谐振模式之间的协同作用。结合偏振态分析（包括偏振旋转角和椭偏角的计算）进一步验证了其宽带高效率的线性偏振转换能力。利用太赫兹时域光谱系统对所设计的偏振器件性能进行测试，实验结果表明，在0.53~1.77 THz范围内，该偏振转换器可将入射太赫兹波的线偏振方向旋转90°，偏振转换效率高于92%。另外，该透射式偏振转换器采用简单的双层金属结构，易于加工并集成到太赫兹通信系统的偏振器件中，该研究为发展高性能太赫兹透射式偏振转换器件提供了有效方案，对推进太赫兹通讯器件的实用化具有重要意义。Terahertz (THz) polarization converters are essential components for advancing THz applications in imaging, sensing, and high-speed communications. However, achieving both broad bandwidth and high conversion efficiency remains a significant challenge. In this work, we propose, fabricate, and experimentally validate a transmissive linear polarization converter (TTPC) operating in the terahertz band, utilizing a bilayer metallic metamaterial structure. The device consists of a top-layer metasurface with a square patch and split-ring resonators and a bottom-layer metallic grating, separated by a polyimide substrate. Through full-wave electromagnetic simulations and surface current analysis, we reveal that the high-performance broadband polarization conversion arises from the synergistic interaction among three distinct resonance modes. Stokes parameter analysis further confirms that the polarization rotation angle remains stable at approximately 90° with near-linear output across the operational band. Experimental characterization using a terahertz time-domain spectroscopy (THz-TDS) system demonstrates that the device achieves a polarization conversion ratio (PCR) exceeding 92% over a broad frequency range of 0.53–1.77 THz, corresponding to a relative bandwidth of 108%. The measured insertion loss varies between 5.5 dB and 12 dB within the operating band, which is attributed to ohmic loss, dielectric absorption, and resonant energy dissipation. Despite these losses, the converter maintains high polarization purity and practical utility. With a compact and fabrication-friendly architecture, the proposed TTPC offers a viable route toward high-performance, broadband polarization control in terahertz systems, paving the way for its integration into next-generation THz communication and imaging devices.
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Keywords:
- terahertz /
- metamaterial /
- polarization converter /
- wideband
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