biostudies-literatureSun SNational Natural Science Fund for Excellent Young Scientists Fund ProgramNational Natural Science Foundation of ChinaBeijing Natural Science Foundation-Non-Consensus Innovation ProjectZhejiang Provincial Science and Technology Plan ("Jianbing and Lingyan") projecte09028https://www.ebi.ac.uk/biostudies/studies/S-EPMC12499377biostudies-literatureUnknown12(37)The optically pumped atomic magnetometer (OPAM) has emerged as an advanced instrument for magnetic field detection. However, the performance of conventional OPAMs is constrained by factors such as non-uniform atomic polarization and insufficient precision in system polarization control. In this study, a bidirectional-pump OPAM based on spin-decoupled metasurface is presented and experimentally demonstrated. By designing a metasurface structure with a predefined phase distribution, the system generates two circularly polarized (CP) lights with distinct chirality and one linearly polarized (LP) light. Two beams of the CP light are directed in opposite directions along both sides of the cell, which effectively mitigates the polarization gradient within the cell and enhances the stability of tAdvanced science (Weinheim, Baden-Wurttemberg, Germany)Polarization-Improved Bidirectional-Pump Atomic Magnetometer Based on Spin-Decoupled Metasurface.PMC12499377F251046423881012024C01099KZ37124001Cheng TLi JZhang JSun SChen LZhu RZhou HfalsePolarization-Improved Bidirectional-Pump Atomic Magnetometer Based on Spin-Decoupled Metasurface.The optically pumped atomic magnetometer (OPAM) has emerged as an advanced instrument for magnetic field detection. However, the performance of conventional OPAMs is constrained by factors such as non-uniform atomic polarization and insufficient precision in system polarization control. In this study, a bidirectional-pump OPAM based on spin-decoupled metasurface is presented and experimentally demonstrated. By designing a metasurface structure with a predefined phase distribution, the system generates two circularly polarized (CP) lights with distinct chirality and one linearly polarized (LP) light. Two beams of the CP light are directed in opposite directions along both sides of the cell, which effectively mitigates the polarization gradient within the cell and enhances the stability of t2025-01-01T00:00:00Z2025 Oct2026-06-04T04:49:34.091Z2026-05-05T03:12:39.648ZS-EPMC124993774061961510.1002/advs.202509028