Exquisitely low-loss optical resonators have thus far remained discrete. Monolithic integration of waveguides with silica resonators that have Q factors >100 million charts a path toward incorporating these devices in photonic circuits.
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Poon, J.K.S. Integrated ultra-low-loss resonator on a chip. Nature Photon 12, 255–256 (2018). https://doi.org/10.1038/s41566-018-0163-y
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DOI: https://doi.org/10.1038/s41566-018-0163-y
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