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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
Published on: December 5, 2025
670
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
Summary
This study introduces a novel tunable electromagnetic absorber utilizing germanium telluride (GeTe). Heating GeTe switches its state, reconfiguring the absorber
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.
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