▎ 摘　　要

NOVELTY - Adjustable terahertz attenuator comprises a substrate PI thin layer and a graphene disc on the substrate PI thin layer, where the graphene disc comprises several sectors and each sector is the graphene generated by laser direct writing PI films of different laser powers, and each piece of fan-shaped graphene is generated by linearly changing the laser rate from the center of the circle outward. The thickness of the laser direct writing PI film is 0.025-0.1 mm, and the dielectric constant is 3.5. The area of each sector is equal, and the laser power is 0.35-1.75 w clockwise. The laser rate variation range is 20-30 mm/second. The disc is movably connected to a bracket, a slider is provided at the bottom of the bracket, and the slider slides in the groove. USE - The adjustable terahertz (THz) attenuator is used for terahetz applications. Uses include but are not limited to wireless communication, security check, biological medical treatment and electromagnetic shielding. ADVANTAGE - The attenuator generates multiple fan-shaped graphene with the same area by using laser of different parameters on the PI film, because the different parameters of the laser induced graphene structure is different and the terahertz wave has different attenuation effect, so as to realize the modulation of the wave. The method has simple process, low cost, high efficiency, and does not use catalyst, the preparation process is more environment-friendly, and can use natural substrate to form LIG, such as cloth, paper, potato peel, coconut shell, cork and active carbon and so on. The device has simple structure, the device modulation method is simple and easy to realize, through different laser power direct write PI film or other material to generate graphene, the microstructure of the graphite is changed, to change the modulation effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the adjustable terahertz attenuator. DESCRIPTION OF DRAWING(S) - The drawing shows a three-dimensional structure schematic view of the graphene disc. 1Laser 2Graphene 4Pi film