Circularly polarized light, which is used in 3D movies, has its electric field vector rotating like a clock hand. It's typically produced by sending light through a filter, but now a team has created a small, solid device that emits partially circularly polarized light, as they describe in the 4 February Physical Review Letters. If this semiconductor technology can be further perfected, it could be used in devices that help biochemists control protein synthesis or help physicists control electrons in spintronics--a futuristic type of electronics.
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