Described herein is an imaging system (200) for a driver monitoring system (100). The imaging system (200) includes a light source (108) for generating an input light beam (202) and projecting the input light beam (202) along a path towards a driver (102) of a vehicle. System (200) also includes a dielectric metasurface (201) positioned within the path of the input light beam (202). The metasurface (201) has a two dimensional array of surface elements configured to impose predetermined phase, polarization and/or intensity changes to the input light beam (202) to generate an output light beam (204) for illuminating the driver (102). System (200) further includes an image sensor (106) configured to image reflected light (208) being light from the output light beam (204) that is reflected from the driver.