Ultra high-Q tunable microring resonators enabled by slow light

Priyash Barya, Ashwith Prabhu, Laura Heller, Edmond Chow and Elizabeth A. Goldschmidt ()
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Priyash Barya: University of Illinois Urbana-Champaign, Department of Electrical and Computer Engineering
Ashwith Prabhu: University of Illinois Urbana-Champaign, Department of Physics
Laura Heller: University of Illinois Urbana-Champaign, Department of Electrical and Computer Engineering
Edmond Chow: University of Illinois Urbana-Champaign, Holonyak Micro and Nanotechnology Laboratory
Elizabeth A. Goldschmidt: University of Illinois Urbana-Champaign, Department of Electrical and Computer Engineering

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract High-Q nanophotonic resonators are crucial for many applications in classical and quantum optical processing, communication, and sensing. We achieve ultra-high quality factors via a method previously limited to bulk systems, preparing a highly transparent and strongly dispersive medium within the resonator that causes a reduction in the group velocity and a corresponding increase in the quality factor. We implement this via spectral hole burning in erbium-doped thin-film lithium niobate microring resonators, and show Q-factors enhanced by nearly three orders of magnitude to exceed 108. Additionally, we show dynamic control of the resonances via electro-optic tuning. Finally, we present a theoretical model for our experimentally observed resonator linewidths, which are not well-described by the standard Bloch equations. Our results show a dramatic reduction in the erbium dephasing rate under a strong optical drive, leading to much narrower linewidths than would otherwise be expected given the large circulating intensity in the resonator.

Date: 2025
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DOI: 10.1038/s41467-025-65533-1

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