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- W3208386005 abstract "It is well known that concentric diffraction gratings are capable of beaming the spontaneous emission of large extended incoherent light sources (e.g., hot radiating surfaces and luminescent materials). Here, we reveal additional properties of such beams using layers of colloidal PbS nanocrystals coated onto metallic spiraling gratings as an example. We observe and explain the formation of multiple beams with a simple model when the spirals are deformed. We also point out an aspect of the light emission that does not seem to have been discussed so far—namely, that the polarization of the directional beams has a radial distribution. These findings are not restricted to our experimental configuration, suggesting a simple way to build incandescent and electroluminescent sources with non-trivial polarization states. The price to pay is an isotropic emission background due to the composite nature of the beams, which result from the incoherent superposition of a continuum of diffracted plasmons everywhere above the surface." @default.
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- W3208386005 date "2021-11-01" @default.
- W3208386005 modified "2023-10-10" @default.
- W3208386005 title "Shaping the spontaneous emission of extended incoherent sources into composite radial vector beams" @default.
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- W3208386005 doi "https://doi.org/10.1063/5.0065486" @default.
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