High performance imaging system using a dielectric metasurface

摘要

An imaging system (200) for a driver monitoring system (100) is described here. The imaging system (200) comprises a light source (108) for generating an input light beam (102) and projecting the input light beam (202) along a path in the direction of a driver (102) of a vehicle. The system (200) also includes a dielectric metasurface (201) positioned within the path of the input light beam (202). The meta-surface (201) has a two-dimensional arrangement of surface elements which are configured in such a way that they impose predetermined phase, polarization and / or intensity changes on the input light beam (202) in order to generate an output light beam (204) for illuminating the driver (102) . The system (200) further includes an image sensor (106) configured to image reflected light (208) that is light from the output light beam (204) that is reflected from the driver.