Abstract
In this study, we propose a thermal frequency reconfigurable electromagnetic absorber using germanium telluride (GeTe) phase change material. Thermally-induced phase transition of GeTe from an amorphous high-resistive state to a crystalline low-resistive state by heating is used to change the resonant frequency of the absorber. For full-wave simulation, the electromagnetic properties of GeTe at 25 °C and 250 °C are characterized at 10 GHz under normal incidence for electromagnetic waves. The proposed absorber is designed based on the characterized electromagnetic parameters of GeTe. A circular unit cell is designed and GeTe is placed at a gap in the circle to maximize the switching range. The performance of the proposed electromagnetic absorber is numerically and experimentally demonstrated. Measurement results indicate that the absorption frequency changes from 10.23 GHz to 9.6 GHz when the GeTe film is altered from an amorphous state at room temperature to a crystalline state by heating the sample to 250 °C. The absorptivity in these states is determined to be 91% and 92%, respectively.
Highlights
Metamaterial is an artificial structure with extraordinary electromagnetic characteristics not found in nature
We developed a thermal frequency switchable electromagnetic absorber using phase change germanium telluride (GeTe) material
Compared to VO2, GeTe is known as a Phase change material (PCM) material with a very high ON/OFF resistance contrast ratio and non-volatile phase change transition, is a potential switching material for RF applications [45,46,47]
Summary
Metamaterial is an artificial structure with extraordinary electromagnetic characteristics not found in nature. Low-cost and easy fabrication are additional advantages Despite these advantages, metamaterial absorbers suffer from narrow absorption bandwidth due to their resonance characteristics. Reconfigurable metamaterial absorbers such as stretchable absorbers have been developed [38,39,40] They provide advantages of cost-effectiveness and simple design. We developed a thermal frequency switchable electromagnetic absorber using phase change germanium telluride (GeTe) material. Compared to VO2 , GeTe is known as a PCM material with a very high ON/OFF resistance contrast ratio and non-volatile phase change transition, is a potential switching material for RF applications [45,46,47]. The proposed electromagnetic absorber can be potentially used for frequency switchable absorption and wireless thermal shock detecting sensor or protection device applications. The proposed material will be explained in detail
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