Multidimensional photodetection of light fields based on metasurfaces or two-dimensional materials

To completely record a light field, photodetectors should be able to obtain corresponding parameters, including the intensity, position, propagation direction, polarization, wavelength, and time. Recently, metasurface-mediated two-dimensional (2D) material photodetectors have provided solutions for compact and integrated devices to obtain the characteristics of a light field, and most current metasurface-mediated 2D material photodetectors have focused on certain criteria. However, few efforts have been devoted to integrating multidimensional photodetection because of conflicts between the different requirements for distinct parameters and difficulties in fabrication. Problems for multidimensional photodetection are discussed, and the solutions may provide insight into next-generation photodetectors.