New photonic chip spawns nested topological frequency comb

https://phys.org/news/2024-06-photonic-chip-spawns-topological-frequency.html

"small silicon nitride chip patterned with 100's microscopic rings... miniaturize frequency combs using microscopic semiconductor resonator rings... topological laser photonics: complex interference repeating patterns circulating light pathways immune to small imperfections, around chip's edge while spiting... comb with relatively broad teeth, each containing smaller comb... enables precise measurements of 2 frequencies separated by wide gap... atomic clocks, rangefinding detectors, quantum sensors"

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