Photonic chip and infrared imaging system using such a photonic chip

A photonic chip for scene illumination, the photonic chip comprising:

• a substrate comprising a face with an etching,
• a plurality of waveguides extending parallel to a plane formed by the etched face of the substrate, each waveguide being configured to guide at least one light beam,
• a plurality of diffraction gratings, each diffraction grating being respectively formed in a waveguide of the plurality of waveguides and each diffraction grating being configured to extract, out of the waveguide in which it is formed and towards the etching of the substrate, the light beam propagating in said waveguide,
• at least two waveguides being configured to receive light beams of different wavelengths,
• and wherein inner surfaces of the substrate forming the etching are configured to extract the light beams out of the substrate, towards the scene to be illuminated, said scene lying against the etched face of the substrate and at the level of the etching of the substrate.