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Sensitivity enhanced tunable plasmonic biosensor using two-dimensional twisted bilayer graphene superlattice.

Fusheng Du1, Kai Zheng2, Shuwen Zeng3

  • 1School of Electronic Engineering and Intelligentization, Dongguan University of Technology, Dongguan, 523808, China.

Nanophotonics (Berlin, Germany)
|December 16, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel tunable plasmonic biosensor using twisted bilayer graphene (TBG) and gold films. Optimized for sensitivity, it can detect SARS-CoV-2 and human hemoglobin with high precision.

Keywords:
GH shiftSARS-CoV-2human hemoglobinsensitivity enhancementtunable plasmonic biosensortwisted bilayer graphene superlattice

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Plasmonic biosensors are crucial for sensitive biomolecule detection.
  • Twisted bilayer graphene (TBG) offers unique electronic and optical properties.
  • Enhancing biosensor sensitivity and tunability remains a key challenge.

Purpose of the Study:

  • To theoretically design and demonstrate a novel tunable plasmonic biosensor.
  • To utilize the Goos-Hänchen (GH) shift for ultrasensitive biosensing.
  • To explore the potential of TBG-based plasmonic structures for biomedical applications.

Main Methods:

  • Fabrication of a plasmonic biosensor by stacking TBG superlattice on a gold thin film.
  • Modulation of the biosensor's performance using the Goos-Hänchen (GH) shift.
  • Optimization of the twisted angle for enhanced sensitivity and tunability.

Main Results:

  • An optimized configuration (44 nm Au film/1-TBG superlattice with 55.3° twist angle) achieved ultra-low reflectivity and ultra-large GH shift.
  • Demonstrated ultra-high GH shift detection sensitivity of 3.9570 × 10^7 µm/RIU for a 0.0012 RIU change.
  • Showcased theoretical possibility for quantitative monitoring of SARS-CoV-2 and human hemoglobin within specific linear ranges.

Conclusions:

  • The proposed TBG-enhanced plasmonic biosensor offers tunable and ultrasensitive detection capabilities.
  • This novel design provides a promising platform for quantitative monitoring of microorganisms and biomolecules.
  • The study highlights the potential of TBG in advancing biomedical sensing technologies.