Based on the dispersive interaction between a high quality factor microcavity and nano-objects, whispering-gallery-mode microcavities have been widely used in highly sensitive sensing. Here, we propose a novel method to enhance the sensitivity of the optical frequency shift and reduce the impact of the laser frequency noise on the detection resolution through Brillouin cavity optomechanics in a parity-time symmetric system. The optical spring effect is sensitive to the perturbation of optical modes around the exceptional point. By monitoring the shift of the mechanical frequency, the detection sensitivity for the optical frequency shift is enhanced by 2 orders of magnitude compared with conventional approaches. We find the optical spring effect is robust to the laser frequency noise around the exceptional point, which can reduce the detection limitation caused by the laser frequency instability. Thus, our method can improve the sensing ability for nano-object sensing and other techniques based on the frequency shift of the optical mode.

中文翻译：

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具有增强动态反作用的布里渊腔光机械传感

基于高质量因子微腔与纳米物体之间的色散相互作用，回音壁模式微腔已广泛应用于高灵敏度传感。在这里，我们提出了一种新方法，通过奇偶时间对称系统中的布里渊腔光力学提高光学频移的灵敏度并减少激光频率噪声对检测分辨率的影响。光学弹簧效应对异常点周围的光学模式的扰动很敏感。通过监测机械频率的偏移，与传统方法相比，光学频率偏移的检测灵敏度提高了 2 个数量级。我们发现光学弹簧效应对异常点周围的激光频率噪声具有鲁棒性，可以减少激光频率不稳定造成的检测限制。因此，我们的方法可以提高基于光模频移的纳米物体传感和其他技术的传感能力。