We propose a type of hybrid structure metalens composed of a graphene-loaded metallic metasurface sandwiched by two mutually orthogonal gratings, which can work in transmission modes for dynamic terahertz wavefront manipulation with tunability and enhanced focusing efficiency. Experimental results show that due to the multi-reflection between the metasurface layer and the grating layers, the focusing efficiency is enhanced by 1.8 times, and the focal length of the metalens is increased by 0.61mm by increasing the applied gate voltage on the graphene from 0V to 1.4V. We hope the proposed structure may open a new avenue for reconfigurable THz metasurfaces with high efficiencies.
Laser-induced graphene (LIG) has received extensive attention due to its excellent properties such as high electrical conductivity, high thermal stability and electrical conductivity, simple synthesis, and low manufacturing cost of patterned structures. However, most research on LIG has focused on electrical applications. In this work, we first examine the influence of the substrate on the LIG generated on polyimide, and then fabricate patterned LIG structures, including gratings and Fresnel zone plates for terahertz (THz) wave modulation. The function of the structure is proved through the experiment of the terahertz focal plane imaging system. It is expected that the LIG-based structure can widen the application of THz technology.
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