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Thermal Frequency Reconfigurable Electromagnetic Absorber Using Phase Change Material.

Heijun Jeong1, Jeong-Heum Park2, You-Hwan Moon3

  • 1School of Electrical and Electronics Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea. jhijun000015@gmail.com.

Sensors (Basel, Switzerland)
|October 20, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel tunable electromagnetic absorber utilizing germanium telluride (GeTe). Heating GeTe switches its state, reconfiguring the absorber

Keywords:
electromagnetic absorberfrequency reconfigurable absorberphase changing materialthermally reconfigurable

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Area of Science:

  • Electromagnetic metamaterials
  • Advanced materials science
  • Photonics and optics

Background:

  • Electromagnetic absorbers are crucial for applications like stealth technology and sensing.
  • Achieving tunable absorption frequencies is a significant challenge in metamaterial design.
  • Phase-change materials offer promising routes for dynamic control of electromagnetic properties.

Purpose of the Study:

  • To propose and demonstrate a novel thermal frequency reconfigurable electromagnetic absorber.
  • To leverage the phase transition properties of germanium telluride (GeTe) for tunable absorption.
  • To numerically and experimentally validate the performance of the proposed absorber.

Main Methods:

  • Characterization of GeTe electromagnetic properties at different temperatures (25 °C and 250 °C) at 10 GHz.
  • Design of a circular unit cell incorporating GeTe at a gap for maximized switching range.
  • Full-wave electromagnetic simulation and experimental validation of the absorber's performance.

Main Results:

  • The GeTe-based absorber demonstrated frequency reconfigurability from 10.23 GHz to 9.6 GHz upon thermal phase transition.
  • Absorptivity remained high, reaching 91% in the amorphous state and 92% in the crystalline state.
  • Successful numerical and experimental validation confirmed the absorber's tunable characteristics.

Conclusions:

  • The proposed GeTe-based electromagnetic absorber offers effective thermal frequency reconfigurability.
  • The study highlights the potential of phase-change materials for dynamic control of electromagnetic devices.
  • This work contributes to the development of advanced tunable metamaterial absorbers for various applications.