Expérimental et théorique
A light-emitting system consists of an active material (laser, LED, incandescent source…) and of elements manipulating the light: lenses, filters and polarizers shaping the directivity, spectrum, and polarization. Adding elements inevitably leads to bulky, energy inefficient and more expensive optical systems. Hence, fabricating sources making the best out of their supplied energy is crucial to reduce environmental footprint of light-related applications. The vision of the project is to fabricate a less than 1 μm thick light emitting system, providing light with high efficiency, controlled spectrum, angular distribution, and polarization : in other words, arbitrary wavefront control with no external manipulation needed. This will be achieved by designing and fabricating Light-Emitting Metasurfaces (LEMs). LEMs are arrays of nanoresonators with luminescent emitters distributed over the entire surface of the device. The array of resonators is designed to provide an extended, electromagnetic mode, incoherently pumped by the emitters distributed over the whole system, then mediating the emission by leaking radiation into the far field. Hence, the properties of the emission can be shaped by engineering the radiative losses of an extended leaky mode. The goal of the internship is to engineer and characterize light sources based on ensembles of quantum dots directly delivering light with controlled properties, that is quantum metamaterials for light-emitting metasurfaces.