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<p>Achieving broadband polarization conversion and high-sensitivity biosensing within a single device remains a major challenge. Most existing designs prioritize one functionality, rely on expensive materials and usually suffer from limited angular stability which restricts their scalability and practical applicability. This study presents a terahertz metasurface design that achieves the rare integration of ultra-wideband polarization conversion and highly responsive biosensing functionality. The proposed device attains a polarization conversion ratio (PCR) exceeding 90% over a broad span of 3.825–8.025 THz, a wide bandwidth of 4.20 THz, a maximum polarization conversion ratio of 99.99%, an average polarization conversion ratio of 97.26% and a full width at half maximum of 5.252 THz. It maintains strong angular stability and preserves its performance at incidence angles up to 30°. As a biosensor, the proposed design shows consistent refractive index sensitivity reaching a peak of 2.62 THz/RIU and effectively distinguishes between healthy and cancerous biological samples including Jurkat cells (leukemia) and basal cell carcinoma tissue (skin cancer). This work represents a noble advancement over existing designs by uniting an ultra-wideband operating frequency range, superior average polarization conversion and highly sensitive biosensing within a single cost-effective device.</p>

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Dual-functional terahertz metasurface with broadband reflective linear to cross polarization conversion and embedded biosensing

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Taha Sheheryar,
  • Bo Lv,
  • Lei Gao

摘要

Achieving broadband polarization conversion and high-sensitivity biosensing within a single device remains a major challenge. Most existing designs prioritize one functionality, rely on expensive materials and usually suffer from limited angular stability which restricts their scalability and practical applicability. This study presents a terahertz metasurface design that achieves the rare integration of ultra-wideband polarization conversion and highly responsive biosensing functionality. The proposed device attains a polarization conversion ratio (PCR) exceeding 90% over a broad span of 3.825–8.025 THz, a wide bandwidth of 4.20 THz, a maximum polarization conversion ratio of 99.99%, an average polarization conversion ratio of 97.26% and a full width at half maximum of 5.252 THz. It maintains strong angular stability and preserves its performance at incidence angles up to 30°. As a biosensor, the proposed design shows consistent refractive index sensitivity reaching a peak of 2.62 THz/RIU and effectively distinguishes between healthy and cancerous biological samples including Jurkat cells (leukemia) and basal cell carcinoma tissue (skin cancer). This work represents a noble advancement over existing designs by uniting an ultra-wideband operating frequency range, superior average polarization conversion and highly sensitive biosensing within a single cost-effective device.