▎ 摘　　要

NOVELTY - Preparing low-reflection graphene terahertz wave band sheet, comprises comprises (i) preparing oxidized graphene film, (ii) designing square Fresnel ring structure, (iii) designing eccentric circle of N circle center on a straight line, (iv) using eccentric circle on the odd position from the inner to the outer as the inner side of the ring belt, (v) using the eccentric circle at the even position is used as the outer side of ring belt to obtain ring belt structure, and (vi) using laser direct writing technology to reduce the oxidation of graphene film obtained in step (a) to obtain the shape of Fresnelring structure of reducing oxidation, and graphene can finish the preparation of the ter ahertz band. USE - Preparation method of graphene-reflection bias-type terahertz wave belt sheet. Uses include but are not limited to imaging, safety monitoring, biological physical therapy detection, non-destructive detection and high frequency communication. ADVANTAGE - The thickness of the obtained terahertz wave band sheet is only 14-20 microns, which is good for the integration of the tera hertz communication and the imaging the reflection rate is low to 10 percent, it has smaller echo loss, and it can effectively improve the stability of the Tera-hertz system of the application. The oxidation part and the reduction part alternately structure also ensures the device to obtain good self-supporting ability under the condition of ultra-thin, which gets rid of the limitation of the traditional wave-band sheet that needs hard by the supporting material. The method provides a low reflection, small thickness, no substrate, flexible deflection.