Abstract
Terahertz metasurface absorption materials, which absorb terahertz wave through subwavelength artificial structures, play a key role in terahertz wave shielding and stealth technology, etc. However, most of the metasurface absorption materials in terahertz suffer from limited tuning range and narrow incident angle characteristics. Here, we demonstrate a liquid-metal-based metasurface through microfluidic technology, which functions as a terahertz absorption material with broadband tunability and wide-angle features. The proposed terahertz metasurface absorption material exhibits an experimental tuning range from 0.246 THz to 0.415 THz (the tuning range of central frequency reaches 51.1%), and the tuning range maintains at high level with wide-angle response up to 60°.
Highlights
Terahertz absorption materials play a key role in applications such as terahertz wave shielding and stealth technology,[1] etc
Metasurfaces have inspired a burgeoning interest in the design of terahertz absorption materials by using a dielectric layer sandwiched between a metallic structure layer and a metal ground layer, matching the impedance to the free space and blocking all of the transmissions, respectively.[2,3,4,5,6]
By tailoring the top metallic structure layer, the spaced dielectric layer, and the bottom metallic film, various absorption performances can be realized.[7,8,9,10]. These proposed metasurface absorption materials usually rely on the electric and magnetic responses of top metallic structures, as well as the magnetic response induced by the inductive coupling between the metallic structures and the ground plane
Summary
Terahertz absorption materials play a key role in applications such as terahertz wave shielding and stealth technology,[1] etc. Liquid-metal-based metasurface for terahertz absorption material: Frequencyagile and wide-angle When the height of the liquid-metal-pillars is changed, the corresponding equivalent capacitance C and inductance L will be controlled, leading to a tunable frequency of the U-shape resonator.
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