▎ 摘　　要

Polarization detection is a powerful tool to enhance the information recognition of objects. Although the photodetectors based on graphene with distinguished features have been considered promising for high-performance light perception applications, they are typically polarization insensitive. We proposed and experimentally achieved a plasmonic-cavity integrated graphene phototransistor for polarization detection. The plasmonic cavity enhances the photoresponse of transverse magnetic waves and restrains that of transverse electric waves, leading to a remarkable polarization extinction ratio as high as 30, surpassing those of all previously reported two-dimensional material-based polarization sensitive photodetectors by 3-10 times. In addition, for the selected polarization, the photoresponse is enhanced by more than one order of magnitude due to the enhanced localized field. We chose near-infrared for demonstration, while the principle is applicable to other wavelength ranges. Published under license by AIP Publishing.