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Highly Sensitive Dual-Band Terahertz Metamaterial Absorber for Biomedical Applications: Simulation and Experiment.

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This study introduces a novel terahertz metamaterial absorber (MTMA) with dual-band absorption. This flexible sensor demonstrates high sensitivity for detecting changes in refractive index, crucial for material interaction studies.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Metamaterial absorbers (MAs) are engineered structures with unique electromagnetic properties.
  • Terahertz (THz) technology offers potential for novel sensing applications due to its unique spectral range.
  • Fractal geometries can enhance the performance of metamaterial devices.

Purpose of the Study:

  • To design and fabricate a flexible terahertz metamaterial absorber (MTMA) with dual-band absorption.
  • To investigate the sensing capabilities of the MTMA based on refractive index variations.
  • To analyze the electromagnetic properties and absorption mechanisms of the proposed structure.

Main Methods:

  • Design of a THz metamaterial absorber incorporating surface Pythagorean tree fractal resonators.
  • Experimental fabrication on a flexible polyethylene terephthalate substrate.
  • Characterization of absorption spectra and sensitivity to refractive index changes.

Main Results:

  • Achieved dual-band absorption peaks >97% at 0.49 THz and 0.69 THz.
  • Demonstrated high sensitivity to refractive index changes (0.0968 and 0.1182 THz/RIU).
  • Observed epsilon-negative and mu-negative material properties at resonance frequencies.

Conclusions:

  • The proposed flexible MTMA exhibits excellent dual-band absorption and high sensitivity.
  • The sensor can effectively assess refractive index variations, enabling material interaction studies.
  • The structure's unique electromagnetic responses contribute to its sensing performance.