Cavity Optomechanical Sensing in the Nonlinear Saturation Limit,Laser & Photonics Reviews

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Cavity Optomechanical Sensing in the Nonlinear Saturation Limit
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-07-16 , DOI: 10.1002/lpor.202100166
Usman A. Javid ₁ , Steven D. Rogers ₂ , Austin Graf ₁ , Qiang Lin _{1,

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Affiliation

Photonic sensors based upon high-quality microcavities have found a wide variety of applications ranging from inertial sensing, electro- and magnetometry to chemical and biological sensing. These sensors have a dynamic range limited by the linewidth of the cavity mode transducing the input. This dynamic range not only determines the range of the signal strength that can be detected, but also affects the resilience of the sensor against large deteriorating external perturbations and shocks in a practical environment. Unfortunately, there is a general trade-off between the detection sensitivity and the dynamic range, which undermines the performance of all microcavity-based sensors. Here, an approach is proposed to extend the dynamic range significantly beyond the cavity linewidth limit by exploiting the periodic nature of the modulation signal, making measurements in the nonlinear transduction regime without degrading the detection sensitivity for weak signals. With a cavity optomechanical system, a dynamic range of over six times larger than the cavity linewidth is experimentally demonstrated, far beyond the conventional linear region of operation for such a sensor. This approach will help design microcavity-based sensors to achieve high detection sensitivity and a large dynamic range at the same time, a crucial property for their use in a practical environment.

中文翻译：

非线性饱和极限下的腔体光机传感

基于高质量微腔的光子传感器已经发现了广泛的应用，从惯性传感、电和磁测量到化学和生物传感。这些传感器的动态范围受转换输入的腔模线宽的限制。这个动态范围不仅决定了可以检测到的信号强度的范围，而且会影响传感器在实际环境中抵抗大的恶化的外部扰动和冲击的弹性。不幸的是，检测灵敏度和动态范围之间存在一个普遍的权衡，这破坏了所有基于微腔的传感器的性能。在这里，提出了一种方法，通过利用调制信号的周期性特性，将动态范围显着扩展到腔线宽限制之外，在非线性转换机制中进行测量，而不会降低对弱信号的检测灵敏度。使用腔光机械系统，实验证明了比腔线宽大六倍以上的动态范围，远远超出了这种传感器的传统线性工作区域。这种方法将有助于设计基于微腔的传感器，同时实现高检测灵敏度和大动态范围，这是它们在实际环境中使用的关键特性。

更新日期：2021-09-16

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