Magnetic-Free Optical Mode Degeneracy Lifting in Lithium Niobate Microring Resonators

Author(s): Xin-Biao Xu, Zheng-Xu Zhu, Yuan-Hao Yang, Jia-Qi Wang, Yu Zeng, Jia-Hua Zou, Juanjuan Lu, Yan-Lei Zhang, Weiting Wang, Guang-Can Guo, Luyan Sun, and Chang-Ling Zou Breaking time-reversal symmetry in integrated photonics without magnetic fields remains a fundamental challenge. We demonstrate phonon-induced nonreciprocity through direct lifting of forward-backward mode degeneracy in microring resonators. Coherent acousto-optic coupling generates differential AC … [Phys. Rev. Lett. 136, 143802] Published Wed Apr 08, 2026