The introduction of cantilever-based fiber-optic microphones (FOMs) has proven to be effective in acoustic sensing. Further improvements in cantilevers face two key constraints: the challenge of achieving minimal sizes with sufficient reflective area and the trade-off between sensitivity and response bandwidth. Herein, we present a geometry optimization framework for a cantilever-based FOM that addresses this issue. Employing drumstick-shaped cantilevers housed within a Fabry–Perot (F–P) interferometric structure, we showcase a heightened sensitivity of 302.8 mV/Pa at 1 kHz and a minimum detectable acoustic pressure (MDP) of 2.35 µPa/√Hz$\rm {\sqrt {Hz}}$. Notably, these metrics outperform those of the original rectangular cantilever with identical dimensions. Furthermore, our proposed cantilever effectively mitigates the reduction in resonance frequencies, thereby improving the response bandwidth. This geometry optimization framework offers considerable design flexibility and scalability, making it especially suitable for high-performance acoustic sensing applications.

中文翻译：

---

悬臂光学麦克风的几何优化

事实证明，基于悬臂梁的光纤麦克风 (FOM) 的引入在声学传感方面是有效的。悬臂梁的进一步改进面临两个关键限制：实现具有足够反射面积的最小尺寸的挑战以及灵敏度和响应带宽之间的权衡。在此，我们提出了一个基于悬臂的 FOM 的几何优化框架来解决这个问题。采用法布里-珀罗 (F-P) 干涉结构内的鼓槌形悬臂，我们展示了 1 kHz 时 302.8 mV/Pa 的高灵敏度和 2.35 µPa/ √的最小可检测声压 (MDP)。赫兹$\rm {\sqrt {Hz}}$。​值得注意的是，这些指标优于具有相同尺寸的原始矩形悬臂的指标。此外，我们提出的悬臂梁有效地减轻了谐振频率的降低，从而提高了响应带宽。这种几何优化框架提供了相当大的设计灵活性和可扩展性，使其特别适合高性能声学传感应用。