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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Stretchable Metamaterials with Tunable Infrared Emissivity for Dynamic Thermal Management.

Zhaoran Li1, Linshuang Long1, Zhipeng Tang1

  • 1Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, PR China.

ACS Applied Materials & Interfaces
|September 2, 2024
PubMed
Summary

Researchers developed a novel metamaterial for dynamic thermal management. Stretching an aluminum disk array on a polydimethylsiloxane substrate dynamically tunes infrared emissivity, showing potential for advanced thermal control applications.

Keywords:
dynamic modulationinfrared emissivityplasmon resonancestretchablethermal management

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Area of Science:

  • Metamaterials
  • Nanotechnology
  • Thermal Management

Background:

  • Infrared emissivity control is vital for dynamic thermal management.
  • Surface structure and optical properties significantly influence emissivity.
  • Metamaterials offer tunable optical properties for advanced applications.

Purpose of the Study:

  • To design and demonstrate a metamaterial for dynamic infrared emissivity control.
  • To investigate the effect of mechanical stretching on emissivity.
  • To achieve tunable thermal management through dynamic emissivity modulation.

Main Methods:

  • Fabrication of an aluminum disk array on a polydimethylsiloxane (PDMS) substrate.
  • Mechanical stretching to induce dynamic changes in surface structure and interdisk gap.
  • Theoretical calculations (plasmon resonance, exposed PDMS area) and experimental validation.
  • In situ stretching platform for real-time emissivity measurement.

Main Results:

  • Optimal metamaterial dimensions determined: 6 μm diameter, 100 nm height.
  • Stretching PDMS substrate altered interdisk gap, tuning infrared emissivity.
  • Demonstrated a 56% modulation in integral infrared emissivity (0.32 to 0.5) at 13% biaxial strain.
  • Achieved a significant temperature difference (44.1 °C) between samples with different periods.

Conclusions:

  • The designed metamaterial enables dynamic control of infrared emissivity via mechanical stretching.
  • This approach offers a promising pathway for advanced, tunable thermal management systems.
  • The material's ability to modulate emissivity makes it suitable for adaptive thermal applications.