Reconfigurable photonic molecules with independently tunable external coupling and mode splitting on thin-film lithium niobate.

Authors

Wenjian Li, Zhenzhong Hao, Zhenyu Chen, Guoquan Zhang, Jingjun Xu, Fang Bo

Published in

Optics letters. Volume 51. Issue 21. Pages 6046-6049. Nov 01, 2026. Epub Oct 06, 2026.

Abstract

Microcavity photonic molecules (PM) provide a versatile platform for optical-field manipulation and photonic Hamiltonian engineering, but their spectral programmability is typically limited by fixed coupling. Here, we report a programmable photonic molecule on thin-film lithium niobate with independently tunable external coupling and mode splitting enabled by two integrated Mach-Zehnder interferometers. Experimental results show that the mode splitting can be tuned up to 17.2 GHz, while the coupling depth can be widely tuned from under-coupling to over-coupling while maintaining a preset splitting. This work provides a compact solution for programmable photonic molecules and reconfigurable lithium-niobate microcavity networks.

PMID:
42962119
Bibliographic data and abstract were imported from PubMed on 31 Oct 2026.

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