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Particles with electric charge 10^(-12)e in bulk mass are not excluded bypresent experiments. In the present letter we provide a feasible scheme tomeasure the millicharged particles via the optical cavity coupled to alevitated microsphere. The results show that the optical probe spectrum of themicro-oscillator presents a distinct shift due to the existence of millichargedparticles. Owing to the very narrow linewidth(10^(-7) Hz) of the optical Kerreffect, this shift will be more obvious, which makes the millicharges more easyto be detectable. We propose a method to eliminate the polarization forcebackground via the homogeneously charged ring, which makes the scheme displaysstrong advantages in precision than the current experiments. The techniqueproposed here paves the way for new applications for probing dark matter andnonzero charged neutrino in the condensed matter.

Probing millicharged particles with ultrasensitive optical nonlinear sensor based on levitated cavity optomechanics