We propose a reconfigurable chiral optomechanically induced Faraday (OMIF) effect in a multimode optomechanical system (OMS), achieving near-absorption-free polarization control. Balanced gain and loss between two MRs establishes quantum destructive interference in two different exciting paths that suppresses the OMIF effect at resonance while enabling lossless polarization conversion at sidebands. The mechanical coupling phase generates synthetic magnetic flux, which selectively controls hybridized mechanical modes and breaks time-reversal symmetry, leading to significant spectral asymmetry and chirality. Coherent mechanical driving further enhances this asymmetry in the dark-mode unbroken (DMU) regime and enables directional control of the chiral optical response in the dark-mode broken (DMB) regime. Crucially, this approach requires neither strong pump fields nor intrinsic magnetic materials, as the nonreciprocal response originates purely from interference and phase engineering. Our work provides a scalable, low-loss platform for on-chip polarization logic devices and chiral integrated photonics.

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• Optomechanics