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May 6, 2026NanophotonicsOpen Access

Ultrasensitive Tunable Terahertz Sensor via Critical Coupling‐Enhanced Fano Resonance

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Authors

FYFei YanCLChenxiang LiuYWYue Wang

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Overview

Proposed terahertz sensor improves sensitivity and figure of merit in biomolecule detection, indicating advancements in device tunability.

Key Points

  • The aim is to develop a highly sensitive and tunable terahertz sensor for various applications.
  • Utilized a cavity-enhanced scheme combining graphene-strip metasurface, microcavity with dielectric analytes, and a gold reflective layer.
  • Implemented a critical coupling mechanism to enhance light-matter interaction.
  • Controlled sensor performance using graphene gate voltage.
  • Achieved sensitivity of 2.7 THz per refractive index unit (RIU) and a normalized sensitivity of 1.5 RIU−1.
  • Recorded figure of merit exceeding 2.54 × 10^6.
  • Enhanced interaction through hybrid coupling mechanisms significantly improves sensing.

Cite This Study

Yan et al. (2026) studied this question.

synapsesocial.com/papers/69fa986a04f884e66b532175https://doi.org/10.1002/nap2.70111
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