Circularly polarized light: (IMAGE)
Caption
A schematic of circularly polarized light. Photons that move in unison along a spiral path, rather than a conventional wave pattern, produce circular polarized light. The light-emitting perovskite layer of the spin-LED device produces either left-handed or right-handed polarized light, depending the spin of the electrons that made it past the perovskite filter.
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Dave3457 via Wikicommons
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