▎ 摘　　要

The temperature-insensitive and separately tunable dual-band metamaterial absorber (MA) based on graphene are investigated at mid-infrared regions. The design scheme is shown in the way of placing two gammadion-shaped metals with different sizes on the corresponding graphene interdigitated finger sets. Numerical results show that the position of two absorption peaks is separately tuned by manipulating the Fermi energy of corresponding graphene interdigitated finger. Different from the conventional tunable dual-band MAs, the dual-band absorption intensities remain strong over a wide ambient temperature ranging up to 800 K. Further results reveal that the dual-band strong absorption can be also maintained even though the top patterned metals are filleted. The separately tunable MA with the above-mentioned features is of potential interest in some areas, such as frequency selective detectors for sensing applications and temperature-insensitive infrared absorbers.