▎ 摘　　要

Plasmonics has been extensively exploited to trap the incident light and enhance the absorption in optoelectronic devices. The availability of graphene as a plasmonic material with a continuously tunable surface conductivity makes it promising to dynamically modulate the absorption enhancement with graphene surface plasmon resonance. In this contribution, we numerically demonstrate that tunable light trapping and absorption enhancement can be realized with graphene-based complementary metasurfaces. Furthermore, we also explore the polarization sensitivity in the proposed device, in which case either a TM or TE plane wave at the specific wavelength can be efficiently absorbed by simply manipulating the Fermi level of graphene. Therefore, this work can find potential applications in the next generation of photodetectors with tunable spectral and polarization selectivity in the mid-infrared and terahertz regions. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement