We report on the realization of a displacement sensor based on an optical nanofiber. A single gold nano-sphere is deposited on top of a nanofiber and the system is placed within a standing wave which serves as a position ruler. Scattered light collected within the guided mode of the fiber gives a direct measurement of the nanofiber displacement. We calibrated our device and found a sensitivity up to 1.2 nm/ $$\sqrt{\text {Hz}}$$ Hz . As an example of application, a mechanical model based on the Mie scattering theory is then used to evaluate the optically induced force on the nanofiber by an external laser and its displacement. With our sensing system, we demonstrate that an external force of 1 pN applied at the nanofiber waist can be detected.

中文翻译：

---

基于纳米纤维的位移传感器

我们报告了基于光学纳米纤维的位移传感器的实现。单个金纳米球沉积在纳米纤维的顶部，系统放置在用作位置标尺的驻波内。在光纤的导模内收集的散射光可以直接测量纳米纤维的位移。我们校准了我们的设备，发现灵敏度高达 1.2 nm/ $$\sqrt{\text {Hz}}$$ Hz 。作为应用示例，然后使用基于米氏散射理论的机械模型来评估外部激光对纳米纤维的光致力及其位移。使用我们的传感系统，我们证明可以检测到施加在纳米纤维腰部的 1 pN 外力。