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Metasurfaces, as artificial materials, exhibit unique characteristics that are distinct from those found in natural materials. These properties, such as the negative refractive index and the inverse Doppler effect, ushered in new possibilities for a wide range of applications, particularly in the field of filtering, absorbing, and other communication devices. This paper introduces a novel approach for creating an electronically controlled tunable terahertz absorber based on liquid crystal and metasurfaces. The ability to modify the equivalent dielectric constant in the liquid crystal layer by leveraging the external electrical field enables the adjustment and control of the terahertz reflected waves. Under the bias saturated state, the liquid crystal molecules in the proposed tunable terahertz absorber align vertically, leading to a specific absorption peak at a frequency of 0.79 THz, with an absorption value of 0.86. However, under the bias off state, the liquid crystal molecules reorient themselves horizontally, with the absorption peaks dropping to two smaller peaks. The utilization of adjustable all-dielectric metasurfaces based on liquid crystal characteristics presents a promising solution that aligns with the demands of contemporary development. These metasurfaces offer versatility across a wide range of frequencies, spanning from microwave to infrared light. This adaptability enables their application in various fields and devices, introducing novel preparation and adjustment methods.
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