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Electromagnetism

Like a speeding watch

A rotation in light's electric-field vector can alter the light's frequency. This rotational equivalent of the Doppler effect has proved surprisingly elusive, but has now been spotted in the laboratory.

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Figure 1: Is that the time?

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Padgett, M. Like a speeding watch. Nature 443, 924–925 (2006). https://doi.org/10.1038/443924a

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