▎ 摘　　要

Three absorption improvement techniques are numerically applied to a multiband metamaterial absorber design for solar energy harvesting. These techniques are the following: the reshaping of the back metallic plate, the integrating of graphene sheets, and the utilizing of indium tin oxide (ITO), in the design. Based on numerical simulation results, each of these methods has the capacity to enhance total absorption rates. In addition to the enhancement in the total absorption rates, new absorption peaks are also obtained within the various frequency regions (infrared and ultraviolet). Furthermore, the absorption enhancement abilities of the mentioned methods are also compared. Among all the techniques, ITO provides the highest absorption rates, as it enhanced the total absorption rate by 48.5%. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)