基于悬浮腔光力学的超灵敏光学非线性传感器探测毫荷电粒子
Probing millicharged particles with ultrasensitive optical nonlinear sensor based on levitated cavity optomechanics
摘要：
本实验并不排除体质量中电荷电荷为10^（-12）e的粒子。本文提出了一种利用悬浮微球耦合光腔测量毫荷电粒子的可行方案。结果表明，微振荡器的光探测谱由于毫荷电粒子的存在而出现明显的位移。由于光克尔效应的线宽很窄（10^（-7）Hz），这种漂移将更加明显，从而使毫电荷更容易被探测到。提出了一种利用均匀带电环消除极化力背景的方法，使该方案在精度上比现有实验显示出很强的优势。该技术为探测凝聚态物质中的暗物质和非零电荷中微子开辟了新的应用途径。
英文摘要：
Particles with electric charge 10^(-12)e in bulk mass are not excluded by present experiments. In the present letter we provide a feasible scheme to measure the millicharged particles via the optical cavity coupled to a levitated microsphere. The results show that the optical probe spectrum of the micro-oscillator presents a distinct shift due to the existence of millicharged particles. Owing to the very narrow linewidth(10^(-7) Hz) of the optical Kerr effect, this shift will be more obvious, which makes the millicharges more easy to be detectable. We propose a method to eliminate the polarization force background via the homogeneously charged ring, which makes the scheme displays strong advantages in precision than the current experiments. The technique proposed here paves the way for new applications for probing dark matter and nonzero charged neutrino in the condensed matter.
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