Ultra High-Q tunable microring resonators enabled by slow light

• URL: http://arxiv.org/abs/2504.19465v1
• Date: Mon, 28 Apr 2025 04:10:44 GMT
• Title: Ultra High-Q tunable microring resonators enabled by slow light
• Authors: Priyash Barya, Ashwith Prabhu, Laura Heller, Edmond Chow, Elizabeth A. Goldschmidt,
• Abstract summary: High-Q nanophotonic resonators are crucial for many applications in classical and quantum optical processing, communication, sensing, and more.<n>We implement this via spectral hole burning in erbium-doped thin-film lithium niobate microring resonators, and show Q-factors exceeding $108$.<n>We present a theoretical model for our experimentally observed resonator linewidths, which are not well-described by the standard Bloch equations.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: High-Q nanophotonic resonators are crucial for many applications in classical and quantum optical processing, communication, sensing, and more. We achieve ultra-high quality factors by preparing a highly transparent and strongly dispersive medium within a resonator, causing a reduction in the group velocity that leads to a nearly three order of magnitude 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 exceeding $10^8$. Additionally, we show that the interplay between the spectrally narrowed resonance and the broader bare resonance produces a Fano lineshape, which we dynamically control 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.

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