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Nonreciprocal transmission in a cavity-magnon system by rotational Sagnac effect

Zhe-Qi Yang, Si-Qi Lin, and Zhi-Rong Zhong*

  • Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou, Fujian 350108, China

  • *Contact author: zhirz@fzu.edu.cn
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Phys. Rev. Research 7, 043256 – Published 8 December, 2025

DOI: https://doi.org/10.1103/27cz-jqd4

Abstract

Ultrahigh nonreciprocal transmission has been achieved in a cavity-magnon system, which consists of two whispering gallery modes (WGMs) and a single magnon mode within a magnetic insulator yttrium iron garnet sphere. The nonreciprocal frequency shift induced by the Sagnac effect enables unidirectional transmission of an input field, while suppressing propagation in the opposite direction, thereby facilitating nonreciprocal optical transmission. Within experimentally accessible parameter regimes, the optical isolation ratio can exceed 40 dB, representing the highest isolation ratio reported to date. Furthermore, applying squeezing to the magnon mode further enhances this isolation performance. Additionally, the directionality of light isolation can be reversed simply by modifying the rotation of the WGM cavity. These findings offer promising prospects for developing high-performance, tunable, and compact optical nonreciprocal devices.

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Phys. Rev. Research 7, 043256– Published 8 December, 2025
  • Received 25 August 2025
  • Accepted 6 November 2025
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