title: Frequency-Switchable Metamaterial Absorber Injecting Eutectic Gallium-Indium (EGaIn) Liquid Metal Alloy.
abstract: 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%.
authors.affiliation: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea. lingkenyunn@hotmail.com.
authors.forename: Kenyu
authors.initials: K
authors.lastname: Ling
authors.affiliation: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea. muechu@naver.com.
authors.forename: Hyung Ki
authors.initials: HK
authors.lastname: Kim
authors.affiliation: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea. yoomin24@naver.com.
authors.forename: Minyeong
authors.initials: M
authors.lastname: Yoo
authors.affiliation: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea. sungjoon@cau.ac.kr.
authors.forename: Sungjoon
authors.initials: S
authors.lastname: Lim
keywords: metamaterial; microfluidics; resonance