Doughnut waveguide preserves twisted light

19 Dec 2018
Twisted light
Twisted sisters: light with OAM values of +1 (top) and 0 (bottom) before (left) and after (centre) passing through the doughnut wave guide. The column on the right shows the inference of the two signals, confirming that helicity has been preserved. (Courtesy: Yuan Chen et al/Phys. Rev. Lett.)

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