▎ 摘　　要

The ability to manipulate the absorption bandwidth has enabled a wide range of applications, from narrowband lasing emission to broadband photodetection. Applying the concept to emerging two-dimensional materials has the potential to enable breakthroughs in advanced compact photonic and optoelectronic devices. Here we present a general method for tailoring the absorption bandwidth of graphene via critical coupling in the near-infrared regime. In a simple two-port resonant structure, dissipative graphene is integrated with a lossless photonic crystal slab, achieving a significant bandwidth manipulation up to 100 times from ultra-narrowband (<0.50 nm) to broadband (>50 nm) with a maximum absorption efficiency of 0.5. The modulation mechanism lies in the intrinsic dependence of bandwidth on the relationship between radiation rate and dissipative loss rate, which is fulfilled by changing the structure parameters and graphene conductivity. This work offers an effective route to engineer light-graphene interactions and shows great prospects in designing high-performance graphene-based devices with enhanced efficiency and flexibility.