All-Euler-bend lithium niobate microresonators with intrinsic Q-factors exceeding 10 million.

Authors

Haoxuan Zhang, Tuo Liu, Biyan Zhan, Xinyan Chi, Xianwen Liu

Published in

Optics letters. Volume 51. Issue 21. Pages 5986-5989. Nov 01, 2026. Epub Sep 30, 2026.

Abstract

We report an ultra-low-loss thin-film lithium niobate microresonator composed of all-Euler-bend geometries. This design allows the use of a multimode waveguide to reduce sidewall scattering loss while suppressing higher-order-mode excitation. Unlike racetrack designs, our microresonator contains no intermediate straight sections, yielding a lithography-friendly footprint of 0.9 mm × 1.7 mm that supports a free spectral range of ∼28.5 GHz and a high intrinsic quality factor of up to 1.2×10⁷. By self-injection locking a distributed-feedback laser to the resonator, we obtained an integrated linewidth of 45.6 kHz within 100 ms, showing a 305-fold improvement over the free-running laser. We further observed low-noise Raman frequency combs at boosted pump powers. These results highlight the potential of all-Euler-bend microresonators for integrated photonic applications.

PMID:
42962104
Bibliographic data and abstract were imported from PubMed on 31 Oct 2026.

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