Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices

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Science  17 Mar 2017:
Vol. 355, Issue 6330, pp. 1187-1191
DOI: 10.1126/science.aaj1699

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Putting plasmons in a spin

The ability of light to carry angular momentum provides an additional degree of freedom for applications such as optical tweezing and optical communication. Spektor et al. show that the optical angular momentum modes of light can be shrunk down to the nanometer scale through plasmonic transfer. They patterned spiral-like structures into an atomically smooth layer of gold, which allowed them to launch plasmons with controlled amounts of angular momentum.

Science, this issue p. 1187