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Sensors 2015, 15(11), 28154-28165;

Frequency-Switchable Metamaterial Absorber Injecting Eutectic Gallium-Indium (EGaIn) Liquid Metal Alloy

School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 24 September 2015 / Revised: 28 October 2015 / Accepted: 4 November 2015 / Published: 6 November 2015
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [930 KB, uploaded 11 November 2015]   |  


In this study, we demonstrated a new class of frequency-switchable metamaterial absorber in the X-band. Eutectic gallium-indium (EGaIn), a liquid metal alloy, was injected in a microfluidic channel engraved on polymethyl methacrylate (PMMA) to achieve frequency switching. Numerical simulation and experimental results are presented for two cases: when the microfluidic channels are empty, and when they are filled with liquid metal. To evaluate the performance of the fabricated absorber prototype, it is tested with a rectangular waveguide. The resonant frequency was successfully switched from 10.96 GHz to 10.61 GHz after injecting liquid metal while maintaining absorptivity higher than 98%. View Full-Text
Keywords: metamaterial; resonance; microfluidics metamaterial; resonance; microfluidics

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ling, K.; Kim, H.K.; Yoo, M.; Lim, S. Frequency-Switchable Metamaterial Absorber Injecting Eutectic Gallium-Indium (EGaIn) Liquid Metal Alloy. Sensors 2015, 15, 28154-28165.

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