Shaping the spontaneous emission of extended incoherent sources into composite radial vector beams

It is well known that concentric diffraction gratings are capable of beaming the spontaneous emission large extended incoherent light sources (e.g., hot radiating surfaces and luminescent materials). Here, we reveal additional properties such beams using layers colloidal PbS nanocrystals coated onto metallic spiraling as an example. We observe explain formation multiple with a simple model when spirals deformed. also point out aspect does not seem to have been discussed so far—namely, polarization directional has radial distribution. These findings restricted our experimental configuration, suggesting way build incandescent electroluminescent non-trivial states. The price pay isotropic background due composite nature beams, which result from superposition continuum diffracted plasmons everywhere above surface.