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.
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Peano, V. Matryoshka frequency combs. Nat. Phys. 17, 1078–1079 (2021). https://doi.org/10.1038/s41567-021-01337-6
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DOI: https://doi.org/10.1038/s41567-021-01337-6
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