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Matryoshka frequency combs
Nature Physics  (IF20.034),  Pub Date : 2021-08-05, DOI: 10.1038/s41567-021-01337-6
Peano, Vittorio

Light propagating in the topological edge channel of an array of ring resonators is predicted to generate nested frequency combs: like a Matryoshka doll containing a set of smaller dolls, each ‘tooth’ of the comb comprises another frequency comb.