Scholarlink

<p>Traditional terahertz polarization converters and biosensors often face limitations such as narrow bandwidth, limited tunability and inadequate angular stability, which restrict their real-world applications. In this work, we present a graphene-based metasurface that integrates ultrawideband polarization conversion with improved biosensing performance. The design achieves polarization conversion ratios exceeding 90% across a frequency range from 8.119 to 17.826 THz resulting in a bandwidth of 9.707 THz and an average efficiency of 97.54%. It maintains a conversion ratio above 96% in two specific bands of 8.319–16.206 THz and 17.434–17.746 THz. The metasurface demonstrates stable response under small oblique incidence with minimal degradation in performance even at a 10° incident angle. For biosensing, the device shows strong sensitivity to refractive index variations achieving a maximum sensitivity of 1.67 THz/RIU. This high sensitivity permits precise identification of refractive-index changes originating from malignant cell states, malaria infection, hemoglobin level variations, and trace water impurities in complex biological samples.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Tunable metasurface for broadband polarization conversion and high-sensitivity biosensing through graphene conductivity control

  • 期刊论文

  • 发表日期：

    2026年7月27日

查看全文
  • Nelson I,
  • Annadurai C

摘要

Traditional terahertz polarization converters and biosensors often face limitations such as narrow bandwidth, limited tunability and inadequate angular stability, which restrict their real-world applications. In this work, we present a graphene-based metasurface that integrates ultrawideband polarization conversion with improved biosensing performance. The design achieves polarization conversion ratios exceeding 90% across a frequency range from 8.119 to 17.826 THz resulting in a bandwidth of 9.707 THz and an average efficiency of 97.54%. It maintains a conversion ratio above 96% in two specific bands of 8.319–16.206 THz and 17.434–17.746 THz. The metasurface demonstrates stable response under small oblique incidence with minimal degradation in performance even at a 10° incident angle. For biosensing, the device shows strong sensitivity to refractive index variations achieving a maximum sensitivity of 1.67 THz/RIU. This high sensitivity permits precise identification of refractive-index changes originating from malignant cell states, malaria infection, hemoglobin level variations, and trace water impurities in complex biological samples.