Scholarlink

<p>This study proposes a wideband graphene-based metasurface absorber on a quartz substrate, offering enhanced absorption, intrinsic tunability, and suitability for advanced sensing and biomedical diagnostics. Unlike conventional absorbers requiring external components, its resonance frequency is dynamically tuned by varying graphene’s relaxation time (0.1–0.3&#xa0;ps), enabling efficient frequency modulation with simplified structure. The metasurface demonstrates high sensitivity to refractive index variations of hemoglobin and urine, directly linked to clinically relevant parameters such as glucose and uric acid. It achieves maximum sensitivity of 2.0 THz/RIU (FOM = 11.1/RIU) for hemoglobin and 6THz/RIU (FOM = 24/RIU) for urine. Additionally, it enhances SNR and suppresses EMI, improving MRI imaging. These features establish it as a promising platform for next-generation terahertz sensing and EMI-shielding applications.</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

Wideband graphene-based THz metasurface absorber with cylindrical dielectric resonator for biomedical refractive index sensing

  • 期刊论文

  • 发表日期：

    2025年12月17日

查看全文
  • Amitabh Kumar,
  • Gaurav Saxena,
  • Yogesh Kumar,
  • Yogendra Kumar Awasthi

摘要

This study proposes a wideband graphene-based metasurface absorber on a quartz substrate, offering enhanced absorption, intrinsic tunability, and suitability for advanced sensing and biomedical diagnostics. Unlike conventional absorbers requiring external components, its resonance frequency is dynamically tuned by varying graphene’s relaxation time (0.1–0.3 ps), enabling efficient frequency modulation with simplified structure. The metasurface demonstrates high sensitivity to refractive index variations of hemoglobin and urine, directly linked to clinically relevant parameters such as glucose and uric acid. It achieves maximum sensitivity of 2.0 THz/RIU (FOM = 11.1/RIU) for hemoglobin and 6THz/RIU (FOM = 24/RIU) for urine. Additionally, it enhances SNR and suppresses EMI, improving MRI imaging. These features establish it as a promising platform for next-generation terahertz sensing and EMI-shielding applications.